Third Grade STEM Activities for Kids (Page 3)

Make String from Algae

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210 reviews

Did you know that the seaweed you've seen in the ocean or even eaten as a snack is inspiring innovators to imagine new materials? Large brown algae, like kelp, contains polymers—long chains of molecules—that are more environmentally friendly than the ones in most plastics. These natural polymers (alginates) could eventually be used to create sustainable everyday objects. Try your hand at using a bit of chemistry to turn biodegradable polymers from algae into your own custom… Read more

Build a Mini Trebuchet

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450 reviews

You probably know what a catapult is. In the Middle Ages armies would use them to hurl stones at castle walls. But did you know about an even bigger type of medieval siege weapon called a trebuchet? Try this project to build a miniature version! Read more

Make a Fire Snake

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612 reviews

With a few simple ingredients, you can create a "fire snake" that appears to grow out of nowhere in this fun experiment! Although it looks magical, no magic is involved—it is all because of a chemical reaction. Try it to find out how it works! Read more

Build a Rubber Band-Powered Car

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572 reviews

Admit it, you've probably launched a rubber band at least once—pulled one end back, and let it go flying. Did you ever suspect that rubber bands could also be a fun way to learn about physics and engineering? Find out in this project where you'll build a rubber band-powered car. Read more

Erupting Diet Coke® with Mentos®

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291 reviews

Have you ever seen the Diet Coke® and Mentos® experiment, which is all over the Internet, and wondered what makes the reaction work? You might think that there is some ingredient in a Mentos candy causing a chemical reaction with the soda, like the way baking soda reacts with vinegar. But the amazing eruption that takes place when Mentos are dropped into Diet Coke is not a chemical reaction at all! Instead it is a physical reaction. That means that all of the pieces of the reaction… Read more

How to Make Slime

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339 reviews

It's gooey. It's sticky. It's slime! Learn to make your own homemade slime with this quick and easy recipe. Read more

Build a Telescope

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147 reviews

Build your own telescope that you can use to see far-off objects in this fun STEM activity! The type of telescope you will build in this activity is also called a monocular or a spyglass. Read more

Build a Robot Hand

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346 reviews

Do you know anyone who has had a hand or an arm injured in an accident? What if you could build them a robotic hand to help them accomplish everyday tasks like writing, picking up a glass, or opening a door? This activity will show you how to build a simple robotic hand using common household materials. Read more

Make a Cotton Ball Launcher

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471 reviews

Have you ever stretched and launched a rubber band at someone? Put that energy to good use and build a rubber band-powered cotton ball launcher in this fun activity! Read more

Build a Mini LED Lightsaber

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139 reviews