action equal to reaction

2010-10-03 6:02 pm
When a ball crashed on a wall, some kinds of energy were wasted like sound and heat. But why action still equal to reaction??

what is the difference between force and energy??
更新1:

some energy leaves to appear as heat and sound. Therefore, if action equal to reaction?

回答 (1)

2010-10-03 8:58 pm
✔ 最佳答案
Force and energy are physical quantities of different nature. A force produces energy when it does work.

When a ball crashes onto a wall, the impact force does work by deforming the ball when it is in touch with the wall. The ball, on restoring to its original shape, doesn't re-gain all the energy (work-done) produced by the impact body. The leaves some energy to appear as heat and sound.


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