What Does It Mean? 🤔
Let's learn together
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Newton's Third Law says that for every action, there is an equal and opposite reaction. That means whenever something pushes on something else, it gets pushed back just as hard in the opposite direction.
Fix tested this with a balloon taped to a straw on a string. When he let go, air rushed backward out of the balloon — and that push backward sent the balloon rocketing forward down the string!
This same idea is exactly how real rockets launch into space. Hot gas blasts out of the bottom of the rocket, and the equal and opposite push sends the rocket flying upward — Newton's Third Law in action.
See It in Action! 👀
Real examples
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A balloon rocket flies forward because of Newton's Third Law!
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Real rockets blast gas downward and get pushed upward in return!
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Paddling a kayak pushes water backward, which pushes the kayak forward!
For Grown-Ups! 👨👩👧
Help kids learn
👨👩👧 Teaching Tips
Use the balloon rocket demonstration as a memorable hook — let kids feel the air rushing out and connect that physical push to the balloon's forward motion before introducing the formal name for the law.
🏫 Classroom Ideas
Set up a string-and-straw balloon rocket race across the classroom and have students measure distance or speed, then discuss why a bigger balloon (more thrust) might travel farther.