A factory worker pushes a crate of mass 30.3 kg a distance of 4.80m along a leve

Question

A factory worker pushes a crate of mass 30.3 kg a distance of 4.80m along a level floor at constant velocity by pushing horizontally on it. The coefficient of kinetic friction between the crate and floor is 0.24.

a-What magnitude of force must the worker apply?
Express your answer using two significant figures.
b-How much work is done on the crate by this force?
Express your answer using two significant figures.
c-How much work is done on the crate by friction?
Express your answer using two significant figures.

Explanation / Answer

a) Force applied = 0.24 x 30.3 x 9.81 = 71.34 N

b) Work done by the force = 71.34 x 4.8 = 342.43 J

c) Work done by friction = 0.24 x 30.3 x 9.81 x 4.8 = 342.43

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