Topics: Jet engine, Newton's laws of motion, Classical mechanics Pages: 3 (638 words) Published: May 21, 2013
‘For every action there is an equal and opposite reaction’ When a balloon is inflated plus released with no tying the inlet, the balloon flies all above the place as the air is released. The balloon and the air flowing out of the balloon travel in opposite directions. The Third Law of Motion states that every action has an equal and opposite reaction. This information can be used to create a balloon pinwheel.

Tape the inlet of the balloon around the straw at the end opposite the flexible joint of the straw. Make sure that the seal is airtight so that the straw can be used to inflate the balloon. Inflate the balloon by blowing through the straw, and once inflated pinch off the straw near the balloon inlet. Push the pin through the straw about an inch and a half from the balloon inlet. Push the pin into the eraser end of the pencil, but leave room for the straw to twirl around freely. Hold the pencil and release the opening of the balloon. Re-inflate the balloon and experiment with different straw angles and balloon sizes to make the pinwheel spin well.  The equal and opposite action and reaction in this experiment were the balloon’s motion and the motion of the air. The air forced out of the balloon caused the balloon to react in the opposite direction. Since the balloon was attached to the straw as a pinwheel, this motion resulted in a circular path. When two actions like this fit the Third Law of Motion, they are called a Third Law pair, and in this experiment the motion of the balloon and the motion of the air are the actions that make up the Third Law pair.



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