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This science fair project idea explores if the length of the string that an object is suspended on has an effect on how fast or slow it swings.

This classic children's game-connecting two cups with a string-demonstrates sound's ability to travel through air vs through a solid.

Learn how to make a ping pong ball anemometerâa device used to measure wind speedâin this free science fair project idea.

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

This science fair project idea discovers whether there are some objects that do not fall at a constant rate.

In this simple circular motion experiment, you'll observe tangential velocity and learn about how acceleration and centripetal force affect an object.

This science fair project idea determines if the size of the parachute will change the rate at which an object falls.

Science fair project idea which teaches you how to make butter by separating cream into butter and buttermilk.

Want to see a great example of Newton's first law? Kids will learn about basic physics with this fun, ballistic experiment.

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

Start your toy engines -- this is going to be a fast and friction-filled race!

This science fair project teaches students about wilting and browning of salad greens.

Using an empty tennis ball can and a swimming pool, you will determine if it's possible to have a conversation under water.

This science fair project idea investigates how the shape of an object affects drag.

This science fair project idea teaches how the gases and pollution in the air affect the earth's atmosphere temperature.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

Kids will learn some cool stuff about chemical reactions by determining what happens when you mix different concentrations of hydrogen peroxide and yeast.

In this science fair project, students examine under what conditions individual plants release seeds and how far the seeds are released.

This simple heat transfer experiment is a great introduction to the concepts of heat transfer and conduction.

Using a toy race car kids create a visual model of the Doppler Effect.

This science experiment examines the role of fat in food, especially in making bread rise and whipping cream.

Make water and clay play a little more scientific with this hands-on experiment that teaches displacement and shows how an object's shape affects its buoyancy.

Science fair project that examines the behavior of water and gravel in creek beds and the formation of sedimentary rocks.

This tricky building block challenge asks your learner to think creatively. They will work on their divergent thinking skills as they try to fill up an index card perfectly with building bricks.

What's the best way to make DIY compost? Kids will learn about aerobic and anaerobic decomposition while learning to appreciate the value of composting.

This science fair project idea examines the reason boats are shaped and engineered.

Develop your child's mathematical and engineering skills with this fun building brick challenge. In this activity, your learner will be challenged to create a boat out of building bricks.

This science experiment tests if dog saliva can really help heal wounds.

Why does honey crystallize? This science fair project project answers this question and identifies the variable that makes this sweet solute crystallize faster.

In this design challenge, your child will create a parachute for a small toy using typical household items.