hypothesis 3rd grade

The Scientific Method Lesson Plan: Developing Hypotheses

Submitted by: charlie conway.

This is a lesson plan designed to be incorporated into a elementary or middle school general science class. Using BrainPOP and its resources, students will be introduced (or further exposed) to the steps necessary to undertake scientific experimentation leading (perhaps) to a Science Fair project. The Scientific Method is a core structure in learning about scientific inquiry, and although there are many variations of this set of procedures, they all usually have similar components. This lesson should take 45-60 minutes, with opportunities for extending the lesson further.

Students will:

• Students will use BrainPOP features to build their understandings of the Scientific Method.
• Students will learn how to identify and write effective hypotheses.
• Students will use game play to write an appropriate hypothesis for an experiment.
• Students will identify and utilize the tools necessary to design a scientific investigation.
• Laptops/Computers
• Interactive White Board
• Pencil/Paper
• Class set of photocopies of the Scientific Method Flow Chart
• BrainPOP accounts (optional)

Vocabulary:

Preparation:.

These procedures may be modified according to the needs/resources of each teacher & class. For example, you may decide to do the quiz with pencil/paper, or do the quiz as a class.

Lesson Procedure:

• Ask the students how scientists answer questions and solve problems. Take a few minutes to explore students' prior knowledge with a short discussion.
• Tell the class that you're going to watch a BrainPOP movie about answering a scientific question about plant growth.
• Show the BrainPOP movie on the Scientific Method two times. The first time, students should just watch and listen. The second time they should take notes. Pause the movie at critical STOP points.
• Students should log on to their individual student accounts and take the Scientific Method Quiz to give the teacher some immediate feedback. (This can also be done as a pre-assessment, or at the very end of the lesson). NOTE: If you choose to, you can give a pencil/paper quiz also; students who work best with electronic media can be given accommodations). If you don't have access to individual student logins via MyBrainPOP (a school subscription), students can take the Review Quiz or paper quiz instead.
• Discuss the main points from the movie: a. Write the definition of the scientific method: the procedure scientists use to help explain why things happen. b. Make a list on the board of the steps mentioned as part of the scientific method: problem, fact finding, observation, inference, hypothesis, experiment, conclusions. c. Tell students that there are various versions of the scientific method that they may see, but they are all basically the same.
• Hand out the Scientific Method Flow Chart . Introduce the "If...then...because..." format for writing hypotheses. Give the students 10 minutes to complete the sheet with their group. They may use their notes from the movie to help them, and/or work collaboratively with other students.
• Discuss some of the student responses in class. Focus on the hypotheses, and explain that a good hypothesis is a testable explanation of the problem. For example, a good hypothesis to the third problem would be, "If I move farther away from the microwave oven, then the cell phone signal will improve because I am further away from the source of interference." Show how this is a TESTABLE hypothesis that can lead to a scientific experiment.
• Introduce the students to the Pavlov’s Dog game in GameUP. Allow time for the kids to explore the game without telling them why they are playing it.
• After 10-15 minutes, have the students take a break from playing, and have a short discussion about the game. Ask if anyone was able to complete the task successfully, and have them share how they got the "diploma." If time allows, show the students how to complete the task so that they all understand that the dog has been conditioned to respond to a stimulus (noise before food has been introduced).
• Have the students write a hypothesis that Pavlov may have written before he started his experiment. Students can either do this with pencil/paper, or the teacher may create a BrainPOP quiz and have students submit their hypothesis electronically. This may be used as a part of the assessment.
• Choose some sample responses from the students, highlighting the hypotheses that are TESTABLE, and not just guesses or predictions.

If this lesson is an introduction to allowing students to plan and carry out their own experiments, then all that follows is naturally an extension to the lesson.

Other, shorter extensions are easy to develop as well.

Extension Activities:

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Scientific Method Worksheets: Free and For All Ages!

Need some scientific method worksheets for your kids?

Wouldn’t hurt if they were free and easy to print?

I got you, Homeschool Mama!

At the bottom of this post you will find 7 Scientific Method Worksheets in a free printable pack! And they can be used for early elementary students to about 7th grade.

They will easily slide into any lesson plan as you teach the scientific method steps!

The 7 Steps Of The Scientific Method

There seem to be several variations out there, but let’s pause and nail down the basics of the scientific method. 

Here is a quick review if you need a brush-up:

1. Make An Observation

The first step is to look at the world around you. What do you notice? What interests you? What are you curious about?

Things outside? In the kitchen?

What do you not understand or have questions about? What would you like to know more about?

Example : My mom waters her flowers every day, but she doesn’t water the grass. But the grass and flowers look to be equally healthy. 

2. Ask A Question

Work with your young scientists to develop a question from their observations.

Example : Do flowers really need to be watered more than the rain that waters the grass? Is my mom just wasting her time?

****Some science curriculum will teach that you should have a step of research at this point in the scientific method. Feel free to do that with older kids to look up background information and enrich your experiment. Younger kids may feel that this step stifles their curiosity or slows down their science learning energy. 

3. Come Up With A Hypothesis (Prediction)

Help your student to make a hypothesis (kids usually love saying this word!) about what they think is the answer to their question. 

Depending on the age of the child, tell them it is an educated guess or a prediction.

Example : I predict that the flowers will do just fine without extra water from my mom.

4. Test The Prediction (Do An Experiment!)

Obviously, this is the fun part of science. 

Kids get to put the books and pencils aside and start building their own science experiments! 

Your students will likely need help with their experimental design. Definitely dig in and help them figure out the best way to test their hypothesis.

For older kids, you might introduce the concepts of independent variables and control group vs. experimental group.

Example : I stop watering the flowers for 1 month while keeping a daily photographic record of the flowers and grass’ health/appearance.

I also keep a data table to monitor rainfall and temperature.

As a control group, I water only one flower regularly as my mother did. 

5. Analyze Results

Now that the experiment is over, it’s time to sit down and do some data analysis.

Which is fancy science talk for looking closely at the results of your experiment. Are there any patterns or trends in your data collection? 

Did anything unexpected happen? What did the experiment show you?

Example : All my flowers are turning brown, but the grass looks about the same. The charts and pictures during the experiment show me that it only took 3 days to start noticing wilting in the flowers. The flowers perked up after a rain, but they would start to wilt again a few days later.  My control flower (that I watered regularly) looks as health as it did on day 1.

6. Compare Results To Your Hypothesis

Look at the results of your experiment and compare them to your prediction.

Was your hypothesis correct or incorrect?

Example : My hypothesis was incorrect. The flowers did not thrive on the same amount of water that the grass gets. 

7. Make a Conclusion

At the end of the experiment, you must write out what you can conclude from your experiment. Older kids should be encouraged to follow up with further questions they have from the results of the experiment.

Example : I conclude that the grass in my yard does not need as much water as the flowers.

As a question for further study, I would like to know if this is only true of the type of flowers in my garden. Would other flowers respond the same way? Why do wild flowers seem so healthy without any human help?

7 Free Scientific Method Worksheets!

Now that we’ve brushed up on our knowledge of the scientific method, let’s dive into these worksheets!

This worksheet is actually a colorful poster displaying all the steps of the scientific method for your students!

I recommend printing it on cardstock or laminating it.

It’s the perfect thing to have displayed in your homeschool or science classes.

This is a follow-up student worksheet that matches the above poster.

The boxes help your student hit all of the most important steps as they work through their own experiments – without being too overwhelming.

I love this science worksheet for simple experiments with first grade and 2nd grade students.

Writing out or drawing every detail as they go along, may seem overwhelming.

This style of worksheet is a fun way of bringing the scientific method down to their level!

This worksheet option goes a step further.

It allows young students to walk through the steps of the scientific method by drawing pictures or writing small phrases.

This can be a great way to make science more approachable!

This worksheet is more appropriate for 3rd grade and up. 

The steps are still slightly abbreviated, but the child is expected to write out sentences. 

This worksheet is perfect for a more detailed and thorough approach.

The student has space for thinking through and writing out their experiment steps. 

Science teachers can get a quick overview of how the student is doing.

This last worksheet is clearly for the older student, such as 5th grade and up.

Writing out full sentences and recording their work is more appropriate at this age. 

The worksheet still provides the structure of showing each of the steps.

****This sheet does have a space for hypothesis and prediction. I left that for the older students because some lessons do teach them as separate things. The hypothesis is the answer to your question, and the prediction is what you think will happen in the experiment. Using my flower/grass experiment from earlier, let me give you an example. Hypothesis : Flowers do not need more water than grass. Prediction : The flowers and grass will look healthy after 1 month of only rainwater.

Click Here To Download Your Scientific Method Worksheet Packet!

You might be wondering why there wasn’t a “typical” worksheet in this post.

Such as a cut and paste, crossword, or match with an answer key. 

The reason is that hands-on activities are the best way to teach the scientific method – not worksheets. Kids will learn science and *remember* it more when they get to DO it.

And as you know, that’s actually true of most things.

I hope these worksheets bless your students and you enjoy exploring the world around you!

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Scientific Method: Step 3: HYPOTHESIS

• Step 1: QUESTION
• Step 2: RESEARCH
• Step 3: HYPOTHESIS
• Step 4: EXPERIMENT
• Step 5: DATA
• Step 6: CONCLUSION

Step 3: State your hypothesis

Now it's time to state your hypothesis . The hypothesis is an educated guess as to what will happen during your experiment. 

The hypothesis is often written using the words "IF" and "THEN." For example, " If I do not study, then I will fail the test." The "if' and "then" statements reflect your independent and dependent variables . 

The hypothesis should relate back to your original question and must be testable .

A word about variables...

Your experiment will include variables to measure and to explain any cause and effect. Below you will find some useful links describing the different types of variables.

• "What are independent and dependent variables" NCES
• [VIDEO] Biology: Independent vs. Dependent Variables (Nucleus Medical Media) Video explaining independent and dependent variables, with examples.

Resource Links

• What is and How to Write a Good Hypothesis in Research? (Elsevier)
• Hypothesis brochure from Penn State/Berks

• << Previous: Step 2: RESEARCH
• Next: Step 4: EXPERIMENT >>
• Last Updated: May 9, 2024 10:59 AM
• URL: https://harford.libguides.com/scientific_method

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55 Terrific 3rd Grade Science Projects Anyone Can Do

Engage students in the classroom, or prep for the science fair!

Want to see your students’ eyes light up? Tell them they’re going to do an experiment! These 3rd grade science projects are easy enough for any classroom or kitchen, and they’re full of science concepts kids need to learn.

To make things even easier, we’ve rated every one of these 3rd grade science experiments based on difficulty and materials:

Difficulty:

• Easy: Low or no-prep experiments you can do pretty much any time
• Medium: These take a little more setup or a longer time to complete
• Advanced: Experiments like these take a fairly big commitment of time or effort
• Basic: Simple items you probably already have around the house
• Medium: Items that you might not already have but are easy to get your hands on
• Advanced: These require specialized or more expensive supplies to complete

3rd Grade Science Fair Projects

3rd grade stem challenge projects, magnet and electricity science experiments for 3rd grade, more 3rd grade science projects and activities.

Use these ideas to build a 3rd grade science fair project. Form your own hypothesis, alter the variables, and see what happens!

Discover the chemistry of slime

Difficulty: Easy / Materials: Medium

Kids adore slime, and it’s actually a terrific way to teach them about polymers. Learn the basics of slime chemistry, then experiment with the formula to make your own unique concoctions.

Make sun prints to display

You’ll need special sun-print paper for this project, but it’s inexpensive and easy to find. Kids learn about chemical reactions as they use the power of the sun to create unique works of art.

Experiment with ice, salt, and water temperature

Difficulty: Easy / Materials: Basic

This simple experiment requires only water, ice, salt, and a thermometer. Your 3rd grade science class can explore how ice and salt affect the temperature, a simple but effective lesson on heat transfer and freezing points.

Learn more: Ice, Salt, and Temperature at 123 Homeschool 4 Me

Experiment with colors

Play around with colors, mix them together, and then use a little science magic to pull them apart again. This chromatography science project requires only simple supplies like coffee filters and markers.

Learn more: Chromatography at 123 Homeschool 4 Me

Understand the science behind bath bombs

Difficulty: Medium / Materials: Medium

Bath bombs certainly make bath time more fun, but what makes them work? Explore chemical reactions and get squeaky clean all at the same time!

Learn more: Bath Bomb Science at Learning Hypothesis

Investigate the effects of erosion

Compare the effects of “rain” on hills of bare soil vs. those covered with grass. Have your 3rd grade science students predict which they think will stand up to erosion better and then test their hypotheses.

Learn more: Erosion Experiment at Third Grade Thinkers

Give flowers a glow-up

This one will make kids’ eyes pop out of their heads! Use highlighters and a black-light flashlight to reveal the vascular system of flowers.

Learn more: Plant’s Vascular System at Tamara “Tamawi” Horne

Grow bacteria from common surfaces

There’s never been a better time to learn about the way germs spread! Take samples from a variety of surfaces, then watch bacteria grow in petri dishes just like grown-up scientists.

Learn more: Growing Germs at Happiness Is Here

Take friction for a ride

Your students will love pulling their way across the floor as they discover more about friction and its effects on motion. Build your own “sled” or use a premade box or tray.

Craft fossils from glue

Create clay molds of natural objects, then fill them with school glue to make your own “fossil” casts. This is a great project to try before a trip to the natural history museum.

Learn more: Glue Fossils at Education.com

Go green with recycled paper

We talk a lot about recycling and sustainability these days, so show kids how it’s done! Recycle old worksheets or other papers using screen and picture frames.

Learn more: Recycled Paper at Undercover Classroom

Filter sediment from dirty water

Explore sediments and water filtration with this easy 3rd grade science experiment. It’s a fun way to learn more about the water cycle.

Learn more: Water Filtration at Teach Beside Me

Put together a compost bottle

Learn about the decomposition of food and how composting can provide nutrients for growing more food with this easy earth science project.

Learn more: Soda Bottle Compost at Busy Mommy Media

Sprout new potatoes

Potatoes grow from tuberous roots, and under the right conditions, new shoots appear from those roots. This 3rd grade science experiment explores the biological science behind cloning.

Use flowers to learn about acid rain

Have you ever wondered what happens to plants when they are exposed to acid rain? Your students can find out by conducting a simple acid rain experiment using flowers and vinegar!

Learn more: Acid Rain Experiment at Little Bins for Little Hands

Keep apples from turning brown

What’s the best method to keep sliced apples from turning brown? Find out with this popular 3rd grade science project.

Learn more: Apple Browning at Teach Beside Me

Fizz it up with antacid

Fizzy fantastic fun! Learn about chemical reactions by mixing water and effervescent antacid tablets to see what happens, comparing the time it takes for whole tablets and small pieces.

Drop objects to learn about gravity

Do heavier objects fall faster than lighter ones? Try this hands-on gravity activity for 3rd graders to find out!

Use these STEM challenges as the basis for science fair project ideas, or try them as in-class science activities your 3rd graders will love!

Design a candy-delivery machine

Learn about inclined planes with this fun simple-machines project. Kids can get creative and develop any kind of delivery system they like!

Learn more: Candy Machine at 123 Homeschool 4 Me

Determine the most waterproof roof

Calling all future engineers! Build a house from LEGO, then experiment to see what type of roof prevents water from leaking inside.

Learn more: Waterproof Roof at Science Sparks

Run marble races with pool noodles

Crack open a pool noodle or two and create your own marble racetracks. Experiment with angles, force, and surface materials to find the fastest way to get the marble to the bottom. ( Find more fun ways to use pool noodles in the classroom here. )

Learn more: Pool Noodle Marble Races at The Techy Teacher

Build a better umbrella

Challenge students to engineer the best possible umbrella from various household supplies. Encourage them to plan, draw blueprints, and test their creations, using the scientific method.

Learn more: Best Umbrella STEM Challenge at Raising Lifelong Learners

Construct a marshmallow catapult

Fling some sweet treats in the name of science! All you need is an old tissue box, pencils, rubber bands, and a few other supplies to learn about trajectory, air resistance, gravity, and more.

Learn more: Tissue Box Catapult at Frugal Fun for Boys and Girls

Blow through a water whistle

Learn about the science of sound with this easy experiment. Kids will love building their own whistles from straws and a glass of water.

Learn more: Water Whistle at My Baba

Step through an index card

With carefully placed scissor cuts on an index card, you can make a loop large enough to fit a (small) human body through! Kids will be wowed as they learn about surface area.

Learn more: Index Card Experiment at Mess for Less

Construct a Hero’s engine

Difficulty: Medium / Materials: Basic

Sir Isaac Newton came up with rules about how things work in the world. One of these rules is called Newton’s third law. It says that “for every action, there is an equal and opposite reaction.” Do an experiment with your 3rd graders to learn more about this rule!

Model the effect of air drag

To learn about the role of drag in flight, students can fold paper planes in different styles and observe how these changes affect the distance and flight pattern of the planes. Turn this 3rd grade science project into a fun competition to see which plane flies the farthest or stays in the air the longest.

Put together an anemometer

This very simple weather instrument is easy enough for kids to build, allowing them to observe and think like a real meteorologist.

These shocking (OK, not literally!) electricity experiments will fit nicely into many 3rd grade science curriculum programs. Give them a try in the classroom, or encourage an interest in science at home.

Assemble a simple circuit

To test the conductivity of different materials, your students can use a simple electric circuit. Invest in a few of these inexpensive gadgets to allow for all kinds of 3rd grade science projects.

Learn more: Simple Circuits at Science Projects

Turn a safety pin into a circuit

Looking for an even easier simple circuits project? This one requires only a few supplies you can grab at the hardware store and an ordinary everyday safety pin.

Investigate how liquids affect magnets

Are magnets equally effective in water? What about oil or a thicker liquid like, say, a milkshake? This would make for an easy 3rd grade science fair project that’s fun too.

Ask a magnet to dance

This is so cool! Make a magnet dance without touching it in this activity that’s part STEM challenge, part magnet experiment, and 100% amazing.

Capture lightning in a bottle

Well, it’s not quite that dramatic, but this cool electricity experiment for 3rd grade will still wow your students.

Separate salt and pepper with static electricity

When you mix up salt and pepper, you’d think it would be almost impossible to separate them again. But using a little static electricity and a plastic spoon, it’s surprisingly simple.

Learn more: Separate Salt and Pepper at Science Kiddo

Explore static electricity with jumping goop

Your students have probably tried rubbing a balloon on their heads to create static electricity with their hair. This experiment is even cooler to see, as a mix of cornstarch and oil seems to leap off the spoon in front of their eyes!

Learn more: Static Electricity Goop at Frugal Fun for Boys and Girls

Predict the distance of lightning

This weather science experiment never fails to impress. Use a stopwatch to measure the difference between the flash and the sound of lightning and thunder, then calculate the distance between you and the strike.

Find your way with a DIY compass

Here’s an old classic that never fails to impress. Magnetize a needle and float it on the water’s surface—it will always point north.

Learn more: DIY Compass at STEAM Powered Family

Defy gravity with magnets and paper clips

Magnets are always a hit in the classroom. Use this simple experiment to discover more about gravity and the effects of magnets on metal objects.

Learn more: Magnet Gravity at Buggy and Buddy

These science experiments for 3rd graders explore all sorts of concepts, from the laws of motion to earth and planetary science and beyond.

Flick pennies to learn about inertia

This is one of those science experiments that kind of looks like magic, but it’s really all about the laws of motion. It might take a little practice to get the index card flick just right, but the results are always cool!

Learn more: Penny Inertia at Frugal Fun for Boys and Girls

See the temperature rise in a chemical reaction

When iron meets oxygen, rust forms. Use vinegar to remove the protective coat from steel wool  and watch the temperature rise from the chemical reaction.

Learn more: Thermal Reaction at 123 Homeschool 4 Me

Float an iceberg

Use a balloon to make an iceberg, then float it in a dish of water to learn how much you can see above and below the waterline. Try experimenting with salt water to see how the density changes things.

Learn more: Icebergs at Science Sparks

Take a Play-Doh core sample

Learn about the layers of the Earth by building them out of Play-Doh. Then students can take a core sample with a straw. ( Love Play-Doh? Get more learning ideas here. )

Learn more: Core Sampling at Line Upon Line Learning

Spin a disappearing color wheel

Color a paper disk with the six primary and secondary colors. Then thread a string through the middle and make it spin. The colors will seem to disappear!

Crystallize some pretty fall leaves

Every kid loves making crystals. In this 3rd grade science project, learn about supersaturated solutions by crystallizing some colorful fall leaves. Then use them as fall classroom decor!

Learn more: Salt Crystal Leaves at STEAMsational

Find a robot’s center of gravity

Print out, cut, and color this free paper robot. Then glue some coins to the back and have your students try to find its center of gravity!

Learn more: Balancing Robot at Buggy and Buddy

Make your own bouncing bubbles

Have your 3rd grade science students put on gloves and watch the bubbles bounce! Then encourage them to experiment with their own bubble solution. Try different soaps, mixing up the ratios to make the strongest bubble possible.

Project the stars on your ceiling

Use the video lesson in the link below to teach 3rd grade science students why stars are only visible at night. Then create a DIY star projector to explore the concept hands-on.

Learn more: Star Projector at Mystery Science

Blow bubbles inside bubbles inside bubbles

If there’s a more fun 3rd grade science project about surface tension than bubbles, we haven’t found it yet! Create a soap solution by using dissolved sugar and discover more about elasticity and volume as you blow bubbles inside bubbles inside bubbles …

Use water balloons to explore buoyancy

Fill water balloons with different solutions (oil, salt water, plain water, etc.) and place the balloons in a large bucket of water to see if they sink or float. This is a cool project to do with your 3rd grade science class on the playground on a sunny day.

Learn more: Balloon Density at 123 Homeschool 4 Me

Learn how water temperature affects density

Looking for a simple, quick, and colorful science experiment? This one just requires some mason jars , hot and cold water, and food coloring . Kids will be amazed at the results!

Learn more: Water Density Experiment at STEAMsational

Dissolve cups to learn about types of change

Teach your 3rd grade science class about the differences between physical and chemical changes with this quick and easy experiment involving Styrofoam cups.

Learn more: Dissolving Cups at The Owl Teacher

Turn crayons into rocks

Demonstrate the effects of heat and pressure on crayon shavings to explain the different types of rocks to students. It’s a colorful intro to geology!

Learn more: Crayon Rocks at The Owl Teacher

 Stab a straw through a potato

Plastic straws may seem flimsy, but by using the power of air pressure, you can make one strong enough to stab all the way through a potato!

Learn more: Stab a Potato at KiwiCo

Shake up some ice cream

Get kids up and moving when they shake their way to ice cream, made from scratch using ice and plastic zipper bags! Talk about heating and cooling as well as condensation while you enjoy your snack.

Learn more: Ice Cream in a Bag at Mom of 6

Examine pine cones opening and closing

Pine cones can sense changes in humidity and adjust their scales in response. Gather several pine cones, glass containers, tweezers, and both hot and cold water to conduct a fun experiment to discover what makes pine cones open and close.

Learn more: Pine Cone Experiment at Parenting Chaos

If you liked these 3rd grade science projects, keep up the STEM enthusiasm with these fun and engaging 3rd grade math games .

Plus, sign up for our newsletters to get all the latest teaching tips and tricks, straight to your inbox.

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Do a Science Fair Project!

How do you do a science fair project.

Ask a parent, teacher, or other adult to help you research the topic and find out how to do a science fair project about it.

Test, answer, or show?

Your science fair project may do one of three things:

Test an idea (or hypothesis.)

Answer a question.

Show how nature works.

Topic ideas:

Space topics:.

How do the constellations change in the night sky over different periods of time?

How does the number of stars visible in the sky change from place to place because of light pollution?

Learn about and demonstrate the ancient method of parallax to measure the distance to an object, such as stars and planets.

Study different types of stars and explain different ways they end their life cycles.

Earth topics:

How do the phases of the Moon correspond to the changing tides?

Demonstrate what causes the phases of the Moon?

How does the tilt of Earth’s axis create seasons throughout the year?

How do weather conditions (temperature, humidity) affect how fast a puddle evaporates?

How salty is the ocean?

Solar system topics:

How does the size of a meteorite relate to the size of the crater it makes when it hits Earth?

How does the phase of the Moon affect the number of stars visible in the sky?

Show how a planet’s distance from the Sun affects its temperature.

Sun topics:

Observe and record changes in the number and placement of sun spots over several days. DO NOT look directly at the Sun!

Make a sundial and explain how it works.

Show why the Moon and the Sun appear to be the same size in the sky.

How effective are automobile sunshades?

Study and explain the life space of the sun relative to other stars.

Pick a topic.

Try to find out what people already know about it.

State a hypothesis related to the topic. That is, make a cause-and-effect-statement that you can test using the scientific method .

Explain something.

Make a plan to observe something.

Design and carry out your research, keeping careful records of everything you do or see.

Create an exhibit or display to show and explain to others what you hoped to test (if you had a hypothesis) or what question you wanted to answer, what you did, what your data showed, and your conclusions.

Write a short report that also states the same things as the exhibit or display, and also gives the sources of your initial background research.

Practice describing your project and results, so you will be ready for visitors to your exhibit at the science fair.

Follow these steps to a successful science fair entry!

If you liked this, you may like:

Home » Tips for Teachers » 14 Engaging Science Fair Projects for 3rd Graders to Ignite Curiosity and Explore the Wonders of the Natural World

14 Engaging Science Fair Projects for 3rd Graders to Ignite Curiosity and Explore the Wonders of the Natural World

In 3rd grade, science education plays a transformative role in shaping young minds. As students progress from foundational learning to deeper understanding, their curiosity reaches its peak. Engaging science fair projects offer a gateway to scientific discovery, moving beyond traditional classroom teaching. By creating, executing, and presenting these projects, 3rd graders gain insights into scientific concepts and develop essential skills.

Science fair projects provide immersive experiences fueled by curiosity. Students become architects of their learning, exploring real-world phenomena, asking questions, and seeking answers. Bridging theory with practice, these projects make science tangible, igniting enthusiasm among young learners.

The impact of science fair projects extends beyond science itself. They foster critical thinking, nurture creativity, hone problem-solving abilities, and refine communication skills. This holistic approach blends knowledge with practicality, curiosity with collaboration, and individual exploration with shared learning.

In the upcoming sections, we’ll explore 14 tailored science fair projects for 3rd graders. Each project aims not only to educate but also to spark wonder and excitement, leaving a lasting impression. Through these projects, we’ll witness the magic of education and curiosity intertwining, creating a vibrant tapestry of knowledge, growth, and an insatiable thirst for discovery.

After reading this article, you’ll get to know about:

• The Significance of Science Education in 3rd Grade→

4 Benefits of Science Fair Projects

• What Do 3rd Graders Learn in Science?→

Discover the Importance of Science Education in 3rd Grade, Uncover the 4 Advantages of Science Fair Projects, and gain insight into the science curriculum for 3rd graders before diving into the projects.

The Significance of Science Education in 3rd Grade

The 3rd grade marks a pivotal point in a student’s educational journey, representing a phase of immense growth and cognitive development. As young learners transition from foundational skills to more advanced learning, their minds become fertile ground for cultivating a deeper understanding of the world. In the 3rd grade, students begin to bridge the gap between concrete and abstract thinking, as their cognitive abilities evolve to encompass more complex concepts.

At this juncture, children are not only curious about the world but are also developing the cognitive tools to explore it in a systematic and structured manner. Their emerging ability to think logically, ask probing questions, and apply critical thinking to their observations makes the 3rd grade a fertile ground for introducing science education. By nurturing this curiosity through science education, educators lay the foundation for a lifelong appreciation of the subject. This early exposure to scientific concepts equips students with the foundational knowledge and skills necessary for their future academic pursuits and prepares them to be informed, engaged citizens who can navigate an increasingly complex and scientific world.

Science fair projects offer a myriad of invaluable benefits to 3rd graders that extend far beyond the classroom walls:

• These projects serve as a bridge that connects theoretical knowledge with real-world applications, providing hands-on learning experiences that are both tangible and relatable. By engaging with scientific concepts through practical experimentation, students develop a deeper understanding of the subject matter. As they actively participate in designing, conducting, and analyzing experiments, they transition from passive recipients of information to active contributors in their own education.
• Furthermore, the process of planning and executing science fair projects cultivates essential life skills. Teamwork is fostered as students collaborate with peers, brainstorm ideas, and share responsibilities. Effective communication skills are honed as students articulate their hypotheses, methodologies, and findings to their classmates, teachers, and parents. Presentation skills are polished as they deliver their findings in an organized and engaging manner, fostering confidence and poise from an early age.
• Additionally, science fair projects spark curiosity and a genuine excitement for learning. The hands-on nature of these projects taps into students’ innate desire to explore and discover, making learning an immersive and enjoyable experience. This, in turn, paves the way for the development of a growth mindset, encouraging students to embrace challenges, learn from failures, and persist in the face of difficulties.
• In essence, science fair projects are vehicles of holistic education. They not only convey scientific principles but also instill essential life skills, foster a passion for learning, and prepare 3rd graders for the ever-evolving demands of the future. Through the process of active exploration and discovery, these projects empower young learners to become confident, curious, and capable individuals who approach both education and life with a sense of wonder and possibility.

What Do 3rd Graders Learn in Science?

In the realm of 3rd-grade science education, students embark on a journey of discovery that mirrors the immersive nature of the curated science fair projects. The foundation is laid through the introduction of fundamental scientific concepts and processes. Much like the science projects encourage experimentation and communication, students learn the art of scientific observation, hypothesis formation, and experimental design. These skills not only echo the hands-on approach of the projects but also equip 3rd graders with the ability to investigate the world around them and effectively convey their findings.

Beyond the building blocks, 3rd graders delve into the diverse branches of science—life science, earth science, and physical science. This mirrors the multidisciplinary nature of the projects, where young learners encounter a tapestry of scientific realms. In life science, they explore living things, their characteristics, and ecosystems, paralleling their interaction with the natural world through experiments. The explorations extend to earth science, where they delve into the planet’s structure, atmosphere, and climate, mirroring their hands-on engagement with the environment. In the realm of physical science, students comprehend matter, energy, and motion, aligning with their manipulation of materials in experiments.

As students navigate the dynamic landscape of 3rd grade science, they foster critical thinking akin to the problem-solving elements of the science fair projects. By asking questions, analyzing data, and drawing conclusions, students are primed to address challenges and dissect complex scenarios. Just as the projects encourage drawing insights from data, 3rd graders are equipped to unravel patterns, make informed decisions, and approach problems strategically.

Furthermore, the correlation between 3rd grade science and everyday life mirrors the practical applications emphasized in the science fair projects. By recognizing the impact of the water cycle on agriculture or understanding the force of gravity’s influence, students grasp the tangible relevance of their scientific knowledge. This parallel enables them to appreciate science’s profound effects on the world, just as the projects merge theory with practice. The connections formed between 3rd grade science and everyday life cultivate a deeper understanding, inspiring students to pursue lifelong learning and cultivate a genuine affection for the realm of science.

My 3rd grader is doing her first science fair project, and it’s somehow one that I don’t already know the outcome for. She’s looking at how temperature affects magnetic strength. We’ll do a bunch of runs of using a magnet to pick stuff up at room temp, 1/x — Humphrey Bogart’s Hairpiece (@Onychomys2) March 22, 2023

14 Engaging Science Fair Projects for 3rd Graders

Now, let’s delve into the realm of science fair projects. Explore a range of projects accompanied by detailed descriptions and instructional videos. These projects are designed to be relatively simple to execute, although occasional assistance from adults may be necessary for children.

1. Floating Egg Experiment

Explore the concept of buoyancy with this experiment. By adding salt to water in a tall glass, you’ll observe an egg floating. Discover the science behind why certain objects float while others sink.

Materials: Eggs, salt, water, tall glass

Level of Difficulty: Easy

• Fill a tall glass with water.
• Gently place an egg into the water. Observe that it sinks.
• Begin adding salt to the water while stirring until the egg starts to float.
• Record your observations and note the amount of salt required.
• Research and explain the scientific principles behind buoyancy and density.

View the video and adhere to the provided instructions. The video serves as an illustrative demonstration of how the experiment can be conducted.

2. Balloon Rocket Race

Embark on a journey to uncover Newton’s third law of motion. Create a balloon rocket by attaching a straw to a balloon and securing it with tape. Release the air from the balloon to propel the rocket forward and measure its distance traveled.

Materials: Balloon, string, straw, tape

Level of Difficulty: Moderate

• Attach a straw to a balloon using tape, ensuring it’s secure.
• Thread a length of string through the straw, creating a taut line.
• Find an open space and have a friend hold the string taut.
• Inflate the balloon and release the air, propelling the rocket along the string.
• Measure the distance the rocket traveled and record the results.
• Research and explain Newton’s third law of motion and the forces at play.

The video presents a demonstration of the experiment’s procedural steps. Additionally, the experiment can be undertaken as a challenge.

3. Rainbow in a Jar

Dive into the world of density by creating a rainbow in a jar. Layer liquids of different densities – honey, dish soap, water, and food coloring – to witness stunning separation and understand the principles of density.

Materials: Honey, dish soap, water, food coloring

• Gather the liquids: honey, dish soap, water, and food coloring.
• Start by adding the heaviest liquid, honey, to the jar.
• Carefully pour the dish soap, followed by water and a drop of food coloring.
• Observe the distinct layers forming in the jar.
• Research and explain the concept of density and how liquids with different densities interact.

This video provides an explanation of density and illustrates the process of conducting the experiment. The video can serve as an instructional guide for performing the experiment.

4. Simple Circuit Project

Immerse yourself in the realm of electricity through a basic circuit project. Construct a simple circuit using a battery, wires, a bulb, and paper clips. Illuminate the bulb by completing the circuit, gaining insights into electricity flow and switches.

Materials: Battery, bulb, wires, paper clips

• Gather the materials: battery, bulb, wires, and paper clips.
• Connect one end of a wire to the positive terminal of the battery and the other end to one side of the bulb.
• Attach a second wire to the negative terminal of the battery and the other end to the opposite side of the bulb.
• Use a paper clip to bridge the gap between the two ends of the wires, completing the circuit and illuminating the bulb.
• Experiment with switches by inserting a paper clip between the wires to break the circuit and turn off the bulb.
• Research and explain the flow of electricity in a circuit and how switches control it.

This video functions as a visual guide, offering instructions that can be utilized during your preparation for a science fair project.

5. Plant Life Cycle Observation

Witness the stages of plant growth with this project. Plant bean seeds in pots, nurture them with soil and water, and observe their transformation from seeds to thriving plants.

Materials: Bean seeds, pots, soil, water

• Fill pots with soil and make a small hole in each.
• Plant bean seeds in the holes and cover them with soil.
• Water the pots regularly and ensure they receive sunlight.
• Observe and document the growth stages of the plants, including seed germination, sprouting, leaf development, and flowering.
• Research and explain the various stages of a plant’s life cycle.

This video offers a valuable resource for students aiming to enhance their science fair presentations. It provides comprehensive insights into the different stages of a plant’s transformation from a seed to a fruit. The content is skillfully simplified to cater to the understanding of primary school students, making it a useful tool for speech preparation.

6. Solar System Model

Embark on a cosmic journey by crafting a solar system model. Use different-sized balls and objects to represent the planets and their positions relative to the sun. Paint and label each planet to create a visually accurate representation of our solar system. Present your model and explain the order of the planets, their unique characteristics, and their relationship to the sun. This project offers an interactive way to learn about the vastness of space and the arrangement of celestial bodies.

Materials: Various-sized balls, paint, labels

• Gather different-sized balls to represent the planets. Use a larger ball for the sun.
• Paint each ball according to the color of the corresponding planet.
• Arrange the balls in their proper order and distance from the sun, following the real solar system layout.
• Label each planet with its name and distance from the sun.
• Research and explain the unique characteristics of each planet and their positions in the solar system.
• Present your solar system model and demonstrate your knowledge of the planets’ arrangement and features.

This video illustrates a method for painting your own planets. It provides a simple and efficient technique to create your customized solar system model quickly.

7. Volcano Eruption

Embark on an explosive journey by creating your own miniature volcano. Craft the volcano using clay, then simulate an eruption by combining baking soda and vinegar. Observe the chemical reaction that triggers the eruption and learn about volcanic processes in a fun and interactive way.

Materials: Baking soda, vinegar, clay, dish soap

• Mold the clay into a volcano shape, leaving an opening at the top.
• Place the clay volcano on a tray or container to catch the eruption.
• Add a small amount of baking soda into the volcano’s opening.
• Mix dish soap with vinegar in a separate container.
• Pour the vinegar and dish soap mixture into the volcano.
• Observe the eruption as the mixture reacts with the baking soda, creating a bubbly foam that mimics volcanic activity.
• Research and explain the chemical reaction between baking soda and vinegar that causes the eruption.

The video showcases the process of creating a volcano and demonstrates how to conduct the associated experiment. By watching the video, you can learn how to construct your own volcano and replicate the experiment for yourself.

8. Homemade Lava Lamp

Fuse science and art with a homemade lava lamp experiment. Mix water, oil, and food coloring in a clear container, then drop an effervescent tablet to witness mesmerizing bubbles that resemble a lava lamp. Explore the science of density and chemical reactions while creating a visually captivating display.

Materials: Water, oil, food coloring, effervescent tablet

• Fill a clear container with water, leaving some space at the top.
• Add vegetable oil to the container, ensuring it forms a separate layer on top of the water.
• Add a few drops of food coloring to the oil, which will gradually sink into the water.
• Break an effervescent tablet into smaller pieces.
• Drop a piece of the tablet into the container and observe as it interacts with the liquids.
• Witness mesmerizing bubbles that rise from the oil layer to the water layer and back.
• Research and explain the science behind the formation of bubbles due to chemical reactions and the role of density in this process.

This video provides detailed instructions on creating 11 different types of DIY lava lamps. Explore various methods and techniques to make your own mesmerizing lava lamp creations.

9. Static Electricity Butterfly

Unleash the power of static electricity by creating a butterfly that “flies” with the touch of a balloon. Inflate the balloon and generate static electricity, causing the tissue paper butterfly to levitate. Understand the science behind static charges and engage in a playful exploration of electric forces.

Materials: Balloon, tissue paper, thread

• Inflate a balloon and tie it to a stationary object.
• Cut out a butterfly shape from tissue paper and attach a piece of thread to its center.
• Rub the balloon against your hair or clothing to generate static electricity.
• Hold the charged balloon near the tissue paper butterfly.
• Observe as the butterfly is attracted to the balloon and hovers in the air due to the static charges.
• Experiment with different objects and distances to control the butterfly’s movement.
• Research and explain the phenomenon of static electricity and how opposite charges attract.

Watch the video to gain insights into the preparation process for the Static Electricity Butterfly science project. Discover the steps and materials required to successfully undertake this engaging experiment.

10. Bouncing Egg Experiment

Discover the extraordinary properties of eggs by conducting a bouncing egg experiment. Submerge a raw egg in vinegar to dissolve the shell, leaving behind a bouncy, membrane-covered egg. Explore the concept of osmosis and observe the egg’s transformation while investigating the inner workings of cellular membranes.

Materials: Raw egg, vinegar

• Place a raw egg gently into a clear container.
• Carefully pour enough vinegar into the container to fully submerge the egg.
• Observe the initial reaction between the eggshell and the vinegar, which will create bubbles.
• Cover the container and let it sit for at least 24 hours.
• After 24 hours, carefully remove the egg from the vinegar and rinse it with water.
• Gently tap the egg on a surface to see how bouncy it has become due to the membrane.
• Research and explain the scientific processes of osmosis and the dissolution of the eggshell.

Observe the video to understand the essential steps in preparing for the Bouncing Egg science project. Acquire valuable insights into the necessary materials and procedures to effectively conduct this engaging experiment.

11. Solar Oven

Harness the power of the sun by constructing a solar oven using a shoebox, aluminum foil, and plastic wrap. Use the oven to heat small items and understand the principles of solar energy conversion. Delve into sustainable energy sources and the potential of harnessing sunlight for practical applications.

Materials: Shoebox, aluminum foil, plastic wrap

• Line the inside of the shoebox with aluminum foil, ensuring it’s reflective.
• Cut a flap in the box lid and cover it with plastic wrap, securing it with tape.
• Place small items, such as marshmallows or chocolate, on a tray inside the box.
• Set up the solar oven in direct sunlight, adjusting the flap to focus sunlight onto the tray.
• Monitor the temperature inside the oven using a thermometer.
• Observe as the items on the tray heat up and potentially melt.
• Research and explain the principles of solar energy conversion and its applications.

View the video tutorial to gain comprehensive guidance on preparing for the Solar Oven science project. Acquire a clear understanding of the required materials and step-by-step procedures to successfully execute this captivating experiment.

12. Water Cycle in a Bag

Condense the water cycle into a simple yet enlightening experiment. Fill a ziplock bag with water, seal it, and observe the water cycle in action as condensation forms on the bag’s interior. Witness evaporation, condensation, and precipitation in a miniature, controlled environment.

Materials: Ziplock bag, water, marker

• Fill a ziplock bag with a small amount of water.
• Seal the bag, ensuring it’s airtight.
• Hang the bag in a sunny window or place it outside in direct sunlight.
• Observe as the water inside the bag heats up and evaporates.
• Over time, notice droplets of condensation forming on the inner surface of the bag.
• As condensation builds up, it may eventually resemble raindrops.
• Research and explain the stages of the water cycle: evaporation, condensation, and precipitation.

Observe the instructional video to acquire valuable insights on how to prepare for the Water Cycle in a Bag science project. Discover the essential materials and follow the step-by-step instructions provided to effectively conduct this enlightening experiment.

13. Magnet Maze

Embark on a magnetic adventure with a maze designed for a paperclip “magnet.” Construct a cardboard maze with hidden metal objects, guiding the paperclip through magnetic forces. Explore magnetism’s invisible yet powerful effects and navigate through the intricacies of magnetic fields.

Materials: Cardboard, magnets, metal objects

• Create a maze design on a flat piece of cardboard.
• Attach magnets to a paperclip, creating a “magnet” that can navigate the maze.
• Place small metal objects strategically within the maze’s walls.
• Hold the maze at an angle, allowing the paperclip “magnet” to move through the maze via magnetic forces.
• Use the magnetic field to guide the paperclip and navigate the maze’s twists and turns.
• Experiment with different angles and approaches to navigate the paperclip through the maze.
• Research and explain the principles of magnetism and magnetic fields.

Discover the process of crafting a magnet maze in this instructional video. The video demonstrates the creation of a maze using cardboard, popsicle sticks, and two rare-earth magnets. Learn how the maze functions as the indicator is maneuvered through it, experiencing resistance from the magnets upon encountering walls or dead-ends.

14. Edible Rock Cycle

Take a delectable journey through geology by crafting an edible rock cycle model. Mold layers of chocolate to represent different rock types, then use a mallet to mimic the forces that transform rocks over time. Learn about the rock cycle while savoring the sweet rewards of hands-on learning.

Materials: Chocolate, wax paper, mallet

• Melt the chocolate and pour it into layers on a piece of wax paper.
• Create layers to represent different types of rocks (igneous, sedimentary, metamorphic).
• Let the chocolate layers cool and harden.
• Once hardened, use a mallet to break the layers into smaller pieces, symbolizing the rock cycle’s forces.
• Arrange the chocolate pieces to illustrate the stages of the rock cycle: melting, cooling, weathering, and pressure.
• As you enjoy the edible rock cycle, research and explain the geological processes behind rock formation and transformation.

Explore the process of conducting the Edible Rock Cycle science project in this informative video. The video provides step-by-step instructions on how to create the edible rock cycle model using chocolate and a mallet. Discover how the layers of chocolate represent different rock types and learn about the geological processes behind rock formation and transformation.

Useful Resources

• 18 3rd Grade Classroom Management Tips and Ideas
• Teaching 3rd Graders Problem Solving Skills
• How to Do a Great Elementary Science Fair Project and Board Layout

In the dynamic landscape of 3rd-grade science education, the power of hands-on learning shines through science fair projects. These 14 engaging science fair projects for 3rd graders offer a gateway to discovery, nurturing curiosity, critical thinking, and creativity. As these young minds delve into density towers, erupting volcanoes, and edible rock cycles, they forge a deeper connection with the world around them. Through these projects, 3rd graders not only grasp scientific concepts but also develop lifelong skills that fuel their journey of exploration and growth. The journey of scientific inquiry has never been more exciting, setting the stage for a future marked by wonder, learning, and unbridled curiosity.

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Simona Johnes is the visionary being the creation of our project. Johnes spent much of her career in the classroom working with students. And, after many years in the classroom, Johnes became a principal.

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Scientific Method for Kids: Steps and FREE Printable Template

Just so you know, this post contains affiliate links. That means if you use them to make a purchase, I may earn a commission. You can read my full affiliate disclosure  HERE .

Are you looking for an easy way to teach the scientific method for kids? I’m sharing each step in this post, along with a free template you can print to help your kids walk through the scientific process.

Being inquisitive is in a kid’s nature. They LOVE asking questions (and come up with some of the best ones!). And although I love to answer them, as they get older I know that part of my job as a homeschool mom is to not answer each and every question for them.

Sooner or later, they need to have the tools to gather information and draw conclusions on their own , whether that happens inside science class or not. For kids, learning the scientific method steps can be a great way to build on skills that will be valuable in many areas of their lives.

An Englishman named Sir Francis Bacon helped create what we know as the scientific method. I thought it was interesting to learn, though, that there were multiple professional scientists and scholars who developed the scientific method over many years , and that many disagree on different ways to implement it. However, there are basic steps that have come to be accepted and taught as the scientific method (and that we get to explore with our kids!).

Scientific Method Steps for Kids

These steps to the scientific method that help us guide our research involve observing and asking questions, formulating a scientific hypothesis (or educated guess), planning and running an experiment, evaluating data and drawing conclusions.

Why Should Kids Learn the Scientific Method?

Why is it important that we teach our kids the scientific method? Isn’t it enough to just have fun doing experiments when we want to? We learn so much from them without formally teaching all of these steps!

Well, yes – we certainly learn a ton from fun experiments! But as my kids are getting older, I am finding they are needing a little bit more structure in thinking through their thoughts, making guesses based on thoughtful observations, and drawing valid conclusions after careful study. These are all important skills to learn and practice. (And don’t worry – I created a FREE printable that will help you walk through this entire process. It’s not as scary as it sounds!) .

Here are some other reasons you’ll want to use the scientific method for kids in your homeschool:

• The scientific process helps us dig in and learn more about God and His creation (and there is so much to observe and learn!).
• Scientists actually use the scientific method to research, study, learn, and solve problems. And your kids will have fun being scientists too!
• Following the scientific method steps allows us to conduct experiments correctly. It also teaches young kids the importance of documenting their steps and research so those that come behind them can replicate results, or build on their research. Carefully recording information is an important skill they will be able to translate to so many other areas.

Steps of the Scientific Method for Kids

Here are the basic steps in the scientific method you’ll want to teach your kids:

• Observe and ask a question.
• Form a hypothesis.
• Do an experiment.
• Evaluate your data.
• Draw a conclusion.

Let’s go over each of the steps in a little bit more detail with an easy example, so you can see how you might teach it in your homeschool. You’ll then be able to use this method with any of your science experiments in your homeschool; my free printable will definitely help walk you through the steps as well , and is a great addition to your kids homeschool scientific journal.

How to Teach the Scientific Method for Kids

Let’s use an easy example to walk through how the scientific method might look.

1. Ask a Question.

You have a couple of plants sitting on your windowsill, and your son asks the simple question about why they are sitting on the ledge. He wonders how the amount of light affects how a plant grows, and if it will grow without light.

And so begins the process of scientific investigation!

The first step for your kids is to take note of what questions they have, or what problems they might want to solve. What is something they are unsure about? Have them brainstorm some ideas and then do some observing and initial research to lay the groundwork for their experiment and help with the next step.

2. Make a Hypothesis.

Next, they’ll form a hypothesis, or an educated guess (a guess made from good reasoning and observing!), about what they think will happen. Before they do so, it might be helpful to make sure the question is clarified and is written in “testable” form, which will help them be clear in their experiment.

For example, the question from above might be, “I wonder if plants can grow in the dark?” You can help guide your child in re-forming this question to make it testable by using phrasing like:

• “Does changing __________ affect ___________ ?”
• “If I change __________, will it affect __________ ?”
• How does changing __________ affect __________ ?”

So – “How does the amount of light affect plant growth?”, or, “If I change the amount of sunlight a plant gets, will it affect it’s growth?”

Your child can then make a guess about what they think will happen, a possible answer, and begin planning on how to conduct the experiment.

3. Do an Experiment.

Now comes the fun part – finding out if you are right or wrong! Your child gets to map out their procedure (what they will actually do, how and what they will record) and make a list of materials they will need to conduct the experiment.

An important part of this step is noting what the independent and dependent variables will be. An independent variable is something that you will change; a dependent variable is what you will measure. A good experiment will only have ONE independent variable at a time – you don’t want to change too many things at once, or it will be hard to measure what actually produced the results.

In our example, our independent variable will be the light source – we’ll put one plant in sunlight and one in a dark place. We’ll try to keep them in rooms of the same temperature, and we’ll use the same amount of soil, same amount of water, and the same number and type of seed in each cup.

The dependent variable is what we are going to measure – how much the plants grow.

4. Evaluate Your Data.

This is the step where they record what is happening, what they observe, and then evaluate the results.

Drawing pictures and/or making graphs can definitely be helpful to display the data collected. Let them be creative with how they record this, but remind them that accuracy and being able to share data with others is important!

5. Draw a Conclusion.

Finally, they get to make a final conclusion. Did the experiment answer your question, and was your hypothesis correct? Thinking about what they learned and other new questions that may have arose as a result of the experiment are worth noting.

In some cases, it might be worthwhile to repeat the experiment with a new hypothesis, or try it again in a slightly different way to help draw conclusions. For example, maybe we could repeat the plant experiment with a different type of plant to see if we got the same results.

Have Fun With It!

Remember that learning about God’s creation and natural world through science experiments should be fun and enjoyable! Choose activities your kids will love, or let them help you decide what fun experiments to try. The skills that they will learn as they work through the scientific method will be valuable for them in years to come.

Can I Use the Scientific Process with my youngest kids?

Absolutely! Even young children will love following along as you perform experiments with your older kids. Although they won’t be able to journal or record data like the bigger kids, simply walking through and talking about the series of steps is a great way to introduce them to the scientific process.

When your little ones ask a good question that might make for a simple science experiment, ask them what they think will happen! Then recruit any older siblings to join in on the fun.

Science Experiment Ideas

You might have kids who are very scientifically-minded, and ask questions about everything! If not, sometimes coming up with a fun experiment can be a stumbling block.

Here are a few scientific questions your kids might have fun exploring, to get you rolling on the first step of practicing the scientific process for kids. These are also perfect to investigate for a science fair project at your school or homeschool co-op!

• Does music affect animal behavior?
• Where are the most germs in your home?
• Which paper towel brand is the strongest?
• What is the best way to keep cut flowers fresh the longest?
• What plant fertilizer works best?
• What brand of battery lasts the longest?
• How much weight can the surface tension of water hold?
• Which soda decays fallen out teeth the most?
• Can hamsters learn tricks?
• What is the effect of salt on the boiling temperature of water? On it’s density ?
• What type of grass seed grows the fastest?

Once they get started brainstorming, your kids can probably come up with lots of ideas to explore for their own experiments!

Scientific Method for Kids Books

There are a few great books you might want to check out as you introduce the scientific method steps. They are also wonderful for experiment ideas!

What is the Scientific Method? Science Book for Kids Mad Margaret Experiments with the Scientific Method (In the Science Lab) Awesome Science Experiments for Kids: 100+ Fun STEM / STEAM Projects and Why They Work Awesome Kitchen Science Experiments for Kids: 50 STEAM Projects You Can Eat! Steve Spangler’s Super-Cool Science Experiments for Kids: 50 mind-blowing STEM projects you can do at home Smithsonian 10-Minute Science Experiments: 50+ quick, easy and awesome projects for kids 101 Great Science Experiments: A Step-by-Step Guide The 101 Coolest Simple Science Experiments

Step-by-Step Scientific Method Printable

My older kids are in 2nd and 3rd grade right now, and I created this printable for them (so it works well for mid-upper elementary-aged students). However, you can absolutely adapt it if you have younger students , or students who aren’t quite ready to do so much writing just yet. You can still teach the process!

This FREE printable comes with one sheet that lists out all the scientific method steps; this is perfect to print out and hang in your homeschool room to refer to. And if your kids are younger, you can verbally talk through the process while doing simple experiments with them, which will help prepare them for a more in-depth process when they get older.

There is also one-page-per-step that walks them through the scientific method, and a basic list of some fun science experiment ideas to try. I also have a one-page sheet your kids can use to write out their process, if you want a simpler, more compact template.

Grab yours for FREE today!

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I hope you have so much fun making memories with your kids learning about science and the scientific method for kids.

Drop a comment below: What has been your favorite science experiment you have done with your kids? What would they say is their favorite?

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Hello! Can the Scientific Method freebie be used with students I am teaching on Outschool? I am using a slide show to teach the steps, but it would be nice to have some resources for them to actually carry out the process. If this does not follow your copyright rules, I totally understand. Thanks for your consideration.

Thank you for asking, Christina, and I would love for you to use it! If possible, please give them the link (or send it to their parents) so they can download it for free from my website. I hope you get a lot of good use out of it!

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25 Science Projects For 3rd Graders

What an exciting age to be a young scientist! 3rd grade science is a fantastic time to engage in all kinds of science projects exploring the living world and how things work! There are so many great skills that kiddos in this age group have already been working on and will continue to develop as they explore, investigate, and discover through hands-on science experiments and science fair projects!

Science Topics For 3rd Graders

So, what exactly does science for 3rd graders look like? And how can you encourage your kids to learn without much effort, fancy equipment, or complex activities that cause confusion rather than curiosity?

Kids are naturally curious, and 3rd grade is an opportune time to introduce and practice the scientific method through fun, hands-on, and easy science projects.

Good science projects for 3rd graders help them ask scientific questions, make predictions, and, with guidance, plan and carry out investigations to answer those questions.

Topics that 3rd graders may cover in science include:

• Changes in motion by forces such as gravity and friction
• Solids, liquids, gases, and changes in states of matter
• Plants and animals and the relationships between them

Below, you will find over 25 of the best science project ideas, covering many of these topics and more.

Our science activities are designed with you, the parent or teacher, in mind! They are easy to set up and quick to do, and most projects will take only 15 to 30 minutes (or longer if kids want to experiment further). Our supply lists usually contain only free or cheap materials you can source from home.

Easy Science Projects For 3rd Graders

Click on the projects below for each activity’s full supply list and step-by-step instructions. Also, check out our helpful tips for developing a 3rd grade science fair project !

Acid Rain Experiment

What happens to plants when rain is acidic? Set up an easy science project with flowers in vinegar. Get kids thinking about what causes acid rain and what can be done about it.

Air Resistance

A quick and easy way to introduce kids to independent and dependent variables. Fold some paper and compare their air resistance when you drop the paper from a height.

A pple Browning Experiment

How do you keep apples from turning brown? Do all apples turn brown at the same rate? Grab some apples and lemon juice and let’s find out.

Use your engineering skills to come up with a cool pool noodle robot that can do art too!

Bottle Rocket

Make a rocket from a water bottle with a cool chemical reaction that is sure to send it flying! Fun chemistry kids will want to do again and again!

Coastal Erosion Model

Ever noticed what happens to the coastline when a big storm rolls through? Set up this beach erosion activity to investigate what happens.

Color Wheel Spinner

Can you make white light from all the different colors? Find out by making your own spinning color wheel.

Crayon Rock Cycle

Explore all the stages of the rock cycle with one simple ingredient, old crayons. Kids will have a blast exploring all the stages, and they can even color with their new rock crayons if you make a few!

Chromatography (with markers)

This chromatography lab is a fun way to explore separating mixtures using everyday supplies!

D rops Of Water On A Penny

How many drops of water can you fit on a penny? The answer might surprise you! Fun and easy way to learn about the surface tension of water.

Dry Erase Marker Experiment

Is it magic or is it science? Either way, this floating drawing experiment is sure to impress! Create a dry-erase drawing and watch it float in water.

Electric Cornstarch

This cornstarch experiment is a fun example of static electricity. Mix up some goop or oobleck, and watch what happens when you bring it near a charged balloon.

Explore the molecules in water and oil and create a tasty chemistry experiment that you can pour on your veggies too!

Engineering: Marble Run (Coaster)

Dig deep into the recycling bin and grab all the cardboard you can find to create a unique ball run or marble coaster! Explore the engineering design process along the way! Make it as small or as elaborate as you want!

Food Chains

All living plants and animals need energy to live on earth. Get kids thinking about how to represent this flow of energy in a simple food chain.

Freezing Water

Explore the freezing point of water and find out what happens when you freeze salt water. All you need are some bowls of water, and salt.

Growing Crystals

Crystals make for fascinating science! Follow our borax crystal recipe to grow crystals overnight for a cool science experiment any rock hound or science enthusiast will love!

Explore magnetism through a variety of hands-on projects perfect for middle school. Our done-for-you magnet STEM pack is filled with extra projects!

Mentos and Coke

Here’s a cool fizzing experiment the kids are sure to love! You might think there’s a chemical reaction happening, but this Mentos and coke experiment is a great example of a physical reaction.

Click here or below to get your free science ideas pack

Mini Paddle Boat

Make a paddle boat that actually moves through the water! Explore forces in motion with this simple DIY paddle boat activity.

Penny Boat Challenge

Design a simple tin foil boat, and see how many pennies it can hold before it sinks. How many pennies will it take to make your boat sink? Learn about the force of buoyancy while you test out your engineering skills.

Popsicle Stick Catapult

What kid doesn’t love to launch stuff into the air? Build a catapult from simple materials, and turn it into a fun experiment as well. Catapults are great for learning about potential and kinetic energy, and more.

Pumpkin Clock

Although this is classically done with a potato, you can definitely experiment with other foods that are similar and test the results.

Red Cabbage Ph Indicator

Learn how cabbage can be used to test liquids of varying acid levels. Depending on the pH of the liquid, the cabbage turns various shades of pink, purple, or green! It’s incredibly cool to watch, and the kids love it!

Salt Water Density Experiment

What happens to an egg in salt water? Will the egg float or sink? There are so many questions to ask and predictions to make with this easy saltwater density experiment.

Slime Science Experiment

Love playing with slime? Now you can turn slime-making into a fun science experiment with these easy ideas.

Spaghetti Tower Challenge

Can you build a tower out of noodles? Build the tallest spaghetti tower that can hold the weight of a jumbo marshmallow. Test out those design and engineering skills with a few simple materials.

Strawberry DNA Extraction

Every living thing has DNA and it is the blueprint for what makes us human. Usually, you need a microscope to see DNA up close. But with this strawberry DNA extraction, you can encourage the DNA strands to release from their cells and bind together so you can see them.

Vinegar and Milk

Kids will be amazed by the transformation of a couple of household ingredients into a moldable, durable piece of a plastic-like substance.

Water Filtration

Can you purify dirty water with a water filtration system? Learn about filtration and make your own water filter.

Using The Scientific Method

The scientific method is a process or method of research. A problem is identified, information about the problem is gathered, a hypothesis or question is formulated from the information, and the hypothesis is tested with an experiment to prove or disprove its validity.

Sounds heavy… What in the world does that mean?!? It means you don’t need to try and solve the world’s biggest science questions! The scientific method is all about studying and learning things right around you.

As children develop practices that involve creating, gathering data evaluating, analyzing, and communicating, they can apply these critical thinking skills to any situation.

LEARN MORE HERE: Using The Scientific Method with Kids

Note: The use of the best Science and Engineering Practices is also relevant to the topic of using the scientific method. Read more here and see if it fits your science planning needs.

Helpful Science Resources

Here are a few resources that will help you introduce science more effectively to your kiddos or students. Then you can feel confident yourself when presenting materials. You’ll find helpful free printables throughout.

• Best Science Practices (as it relates to the scientific method)
• Science Vocabulary
• 8 Science Books for Kids
• All About Scientists
• Science Supplies List
• Science Tools for Kids
• Join us in the Club

Turn It Into A 3rd Grade Science Fair Project

Science projects are an excellent tool for older kiddos to show what they know about science! Plus, they can be used in all sorts of environments including classrooms, homeschool, and groups.

Kids can take everything they have learned about using the scientific method , stating a hypothesis, choosing variables , making observations and analyzing and presenting data.

Want to turn one of these experiments into an awesome science fair project? Check out these helpful resources.

• Science Project Tips From A Teacher
• Science Fair Board Ideas
• Easy Science Fair Projects

Free Printable Science Journal Worksheets

Create a science notebook with these easy-to-use science worksheets to accompany any experiment. Grab your free science process journal pack !

Printable Science Projects Pack

If you’re looking to grab all of our printable science projects in one convenient place plus exclusive worksheets and bonuses like a STEAM Project pack, our Science Project Pack is what you need! Over 300+ Pages!

• 90+ classic science activities  with journal pages, supply lists, set up and process, and science information.  NEW! Activity-specific observation pages!
• Best science practices posters  and our original science method process folders for extra alternatives!
• Be a Collector activities pack  introduces kids to the world of making collections through the eyes of a scientist. What will they collect first?
• Know the Words Science vocabulary pack  includes flashcards, crosswords, and word searches that illuminate keywords in the experiments!
• My science journal writing prompts  explore what it means to be a scientist!!
• Bonus STEAM Project Pack:  Art meets science with doable projects!
• Bonus Quick Grab Packs for Biology, Earth Science, Chemistry, and Physics

~ Projects to Try Now! ~

• Español NEW

Hypothesis facts for kids

A hypothesis is a proposed explanation for some event or problem.

Cardinal Bellarmine gave a well known example of the older sense of the word in his warning to Galileo in the early 17th century: that he must not treat the motion of the Earth as a reality, but merely as a hypothesis.

Today, a hypothesis refers to an idea that needs to be tested . A hypothesis needs more work by the researcher in order to check it. A tested hypothesis that works, may become part of a theory or become a theory itself. The testing should be an attempt to prove the hypothesis is wrong. That is, there should be a way to falsify the hypothesis, at least in principle.

People often call a hypothesis an "educated guess".

Experimenters may test and reject several hypotheses before solving the problem.

A 'working hypothesis' is just a rough kind of hypothesis that is provisionally accepted as a basis for further research. The hope is that a theory will be produced, even if the hypothesis ultimately fails.

Hypotheses are especially important in science. Several philosophers have said that without hypotheses there could be no science. In recent years, philosophers of science have tried to integrate the various approaches to testing hypotheses, and the scientific method in general, to form a more complete system. The point is that hypotheses are suggested ideas which are then tested by experiments or observations .

In statistics , people talk about correlation : correlation is how closely related two events or phenomena are. A proposition (or hypothesis) that two events are related cannot be tested in the same way as a law of nature is tested. An example would be to see if some drug is effective to treat a given medical condition. Even if there is a strong correlation that indicates that this is the case, some samples would still not fit the hypothesis.

There are two hypotheses in statistical tests, called the null hypothesis and the alternative hypothesis. The null hypothesis states that there is no link between the phenomena. The alternative hypothesis states that there is some kind of link. The alternative hypothesis may take several forms. It can be two-sided (for example: there is some effect, in a yet unknown direction) or one-sided (the direction of the supposed relation, positive or negative, is fixed in advance).

Related pages

• Falsifiability
• Thought experiment
• This page was last modified on 16 October 2023, at 16:53. Suggest an edit .