A rubber ball is dropped from 1.2 m. It bounces to 0.84 m, then to about 0.6 m, and it slowly stops…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A rubber ball is dropped from . It bounces to , then to about , and it slowly stops.
- What part of its energy did it lose in the first bounce, in percent?
- Has the energy been destroyed? Explain.
Need a reminder? The key ideaShow
Energy is never made or destroyed. With no air or friction, stays the same: after a fall of , , and a ball thrown up at rises .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) It keeps of its energy, so it loses .
Step 2. (b) No. At each bounce some energy becomes heat (the ball and the floor warm a little) and sound. The total stays the same; only the ball's share shrinks.
Answer: ; no, it changes into heat and sound.
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