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Middle School STEM Activities for Kids (211 results)

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Measure Photosynthesis with Floating Leaves
STEM Activity
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228 reviews
Do you know how plants get the energy they need to grow and reproduce? They do not eat like humans and animals do; they make their own food with a process called photosynthesis. During photosynthesis, plants convert light, water, and carbon dioxide from the air into oxygen and sugars. In this activity, you will be able to observe the oxygen production in leaves by doing a floating leaf disk experiment. You can also find out how quickly plants produce oxygen, and what variables affect… Read more
Make Your Own Harmonica!
STEM Activity
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297 reviews
Can you name the bestselling musical instrument in the world? If you said harmonica, you are right! The harmonica was said to be patented in 1821 by Christian Buschmann, a 16-year-old German boy. Since then, it has become the top-selling instrument in the world and a household item in many places. Luckily, creating beautiful noise is not just an art—it is also a science! In this activity, you will design and explore your own harmonica-like instrument made from household items. Time to… Read more
Make a Cotton Ball Launcher
STEM Activity
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483 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
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Make String from Algae
STEM Activity
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221 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 Wind-Powered Car
STEM Activity
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367 reviews
Is that a sailboat or a sail...car? Design and build a toy car powered by the wind in this fun engineering project! Read more
Build a Bristlebot, a Tiny Toothbrush Robot
STEM Activity
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178 reviews
Do you think you could build a robot on the head of a toothbrush? Bristlebots are simple, tiny robots that buzz around like bugs. They are easy to build and fun to play with, and you do not need any previous experience with robotics to make one. You can even build two bristlebots and race them against each other! Move on to the Materials section to see what parts you need to build bristlebots, and the instructions for step-by-step directions on how to build them. Read more
Grow Rock Candy Crystals
STEM Activity
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200 reviews
Did you know you can grow your own lollipop? In this activity, you'll learn how to grow your very own rock candy. It is an easy process and not labor-intensive. So, what are you waiting for? See how large you can grow your sugar crystals before temptation takes over. Read more
Make Cardboard Automata
STEM Activity
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111 reviews
Have you ever wondered how to create art with moving parts using nothing but cardboard, a few skewers, and some craft supplies? In this fun STEM activity, you will build an automaton, a machine that makes parts appear and disappear, move up and down, spin in circles, or all of these together. The instructions will show you how to build a moving caterpillar, but you can use your imagination to build any other animal or object you want! Read more
Make Your Own Seismograph
STEM Activity
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343 reviews
Scientists study earthquakes so we can understand them better and hopefully one day predict them so we can save thousands of lives. A seismograph is a tool scientists use to record earthquakes and measure their strength. In this activity you will build your own seismograph using simple materials. Read more
Make a Miniature Water Cycle Model
STEM Activity
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167 reviews
Have you ever wondered where the rain that falls from the sky comes from? You might say the rain falls from the clouds, but what are clouds and where do they come from? All these questions and many more can be answered by looking into how water moves on land and in the atmosphere, which is described in the water cycle. In this activity, you will investigate some of the processes that make water move in and out of the atmosphere by making a miniature water cycle model inside a plastic bag. Read more
Make Magnetic Slime
STEM Activity
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367 reviews
What happens when you add iron filings to regular slime? You get magnetic slime! Make your own magnetic blob that will swallow up a magnet in this fun experiment. Read more
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