Thread: Work equation?
View Single Post
russ_watters
#3
Aug3-04, 07:58 AM
Mentor
P: 22,239
Quote 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.
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.

Does the force that keeps the moon in orbit apply work?
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.