This Valentine’s Day, make these bouncy balls using just borax, glue, and corn starch! Kids will be amazed at how easy it is to make a homemade bouncy ball!
We’ve made a lot of slime in our day, but did you know, that if you change a bit of the ratios and ingredients, you can make a whole host of other things? We found by adding corn starch to our standard slime recipe, we could make a homemade bouncy ball. It’s amazing how simple it is to make your own homemade toys that really bounce!
Homemade Bouncy Ball Valentine’s Day STEM Activity for Kids
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What you’ll need to make your homemade bouncy ball:
In cup two, mix 4 tablespoons of warm water and 1 teaspoon of borax powder. This is the recipe we started with.
Mix each cup together, then slowly add the borax water to the glue mixture. It will turn into slime, then harden even further into a pliable mixture like play dough.
Work the ball between your fingers until it is no longer sticky and you can roll it into a ball.
Bounce it on a surface and see what happens!
STEM Questions to Ask
What happens if you add more glue (borax, water, cornstarch)?
Which recipe bounces the highest?
How much higher does the bounciest recipe bounce than the least bouncy recipe?
What makes the ball bounce?
Will the ball bounce on carpet (cement, wood, a table, a counter, etc)?
Will the ball hold its shape over time?
Bouncy Ball STEM Elements
You can learn a lot when making a homemade bouncy ball! Here are just a few STEM elements that go along with this lesson:
Science: Polymer chains, chemical reactions, the scientific method.
Technology: Using recipes, and tools to follow directions.
Engineering: Find the perfect recipe to make the highest-bouncing ball!
Math: Physics, measuring the height of each recipe’s jump, comparing between recipes.