2nd - 5th Grade Physical Science Activities

Explore scientific concepts with this experiment that introduces kids to the scientific method!

In this Halloween-themed activity, young learners will find out what happens when they mix two household items together to create a surprising chemical reaction.

This science fair project idea experiments with spinning color wheels and optical illusions.

In this fun science fair project idea learn about universal solvents and solutes and find out the solubility of several common liquid substances.

Sink or swim? Calculate the density of various fruits and vegetables using water and a kitchen scale.

Little scientists will make inferences about hearing loss, pitch, and frequency in this great science fair idea that puts the human ear to the test.

Here's an experiment that will have your child experimenting with cake ingredients to learn about the chemical reactions that happen when a cake's in the oven.

The pinwheel is a simple toy that has been around for years and uses the wonders of the wind to spin it and delight kids of all ages!

This science fair project idea explores whether talking to a plant will help it grow.

In this free science fair project, learn how to separate salt from water using heat. A great science project for elementary school kids.

Inspire your child to put on her engineer hat for the day, as she builds her very own, double-decker bridge.

Encourage your child to think outside the bathtub by making her very own handmade soaps! Perfect as a present, a decoration, or just to pamper herself.

In this activity, you'll not only make your own bouncy balls at home, but your child will also learn how polymers are made.

Help your fifth grader execute this experiment involving a lit candle (submerged in water!) to show him the wonders of heat energy transference.

What's a liquid? What's a solid? What better way to experiment than by turning a childhood favorite, ice cream, into a homemade science lesson!

The objective of this science fair project idea is to determine if sound travels best through the air, water or a solid.

Your kid can learn about the process of making frozen yogurt and enjoy a homemade, flavorful dessert. Experiment with this fun, chilly food!

This taste buds science experiment demonstrates how strongly our sense of smell controls what we taste.

How do series and parallel circuits work, and which produces the brightest light in a light bulb? Construct both in this project and find out!

Try this experiment to give your curious kid a more "solid" understanding of how temperature affects the states of matter.

How powerful is the reaction between baking soda and vinegar? Find out here!

This science fair project demonstrates the principles of reflection through simple experiments involving mirrors and light.

Teach your child some scientific basics as you explore the densities of various liquids in this fun experiment.

Is it solid or liquid? Create oobleck and witness the amazingly weird oscillation between the two!

An hour glass, also known as a sand clock, keeps time. In this activity, your child will make her own sand clock and measure the time it keeps.

Turn the common pastime of constructing paper airplanes into a lesson on the physics of aerodynamics and flight with this fun science activity.

Learn with makes water molecules work with this fun and easy science activity!

The purpose of this science fair project is to build a basic radio.

Every time a sound is produced it emits a sound wave. This experiment demonstrates how sound travels, using nothing more than a spoon and a string!

This science fair project idea produces varying pitches of sound.