I'm having a problem understanding a question. "If a man exerts a 200N force while pushing a crate 5.0 m across a floor against a frictional resistance of 40N, how much energy was expended by the person pushing?" I can figure out work done on the box and those sorts of questions but I don't get what is meant by how much energy is the man expending.
2 answers
The work expended is the applied force (200 N) times the distance the crate moved (5.0 m). The amount of friction does not affect that result.
Thank you.
2 answers