just came across a fsq in which the answer for work done on a treadmill after running a few miles was 0 J, because in W = F x d, distance = 0. Seems crazy to me - obviously some work was done, right?
Well, say you had a treadmill that wasn't on and just powered by your feet. Then, you would be exerting a force to move the treadmill treads some distance back so you would be doing work.
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