- #1
Warlic
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Homework Statement
Homework Equations
E(p)=mgh
W = Fs
3. The Attempt at a Solution
The book says the crane does mgh amount of work, while gravity does -mgh.
What I don't understand is, for the box to be lifted up, doesn't string tension force have to be bigger than gravity - or else it would remain in place and not accelerate upwards? If so, formula for work is W=Fs, the distance s is same for both forces, but string tension force is bigger, so doesn't crane do more absolute work on the box that gravity?