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View Full Version : Does energy just 'disappear'?



Ross PK81
2009-Mar-14, 11:32 PM
If you rolled a ball, the energy that you used to push it get's transferred to the ball so it rolls.

But once it stops rolling, has that energy just disappeared?

Van Rijn
2009-Mar-14, 11:48 PM
No, the ball is slowed by friction, and the kinetic energy is converted to heat. And, more generally, energy is conserved.