 Quote by Vern
Your analogy of a man pushing a rock is not a good example. The man is a complex mechanism with every cell doing work just to stay in existance.
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Actually, the analogy works fine - what he's missing is the difference between
input and
output. The calories burned by the man are energy input, the work done on the rock is work output.
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Does the force that keeps the moon in orbit apply work?
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Sounds strange, doesn't it - the earth applies a force causing the moon to be in constant acceleration - yet no work is done. But thats the way it sometimes works.