Asked by kwaku

A block is pushed 2 m along a fixed horizontal surface by a horizontal force of 10 N. The opposing force of friction is 0.4 N
(a)How much work is done by the 10 N force?
(b)what is the work done by the friction force

Answers

Answered by bobpursley
work= force.distance= 10*2=20n
friction=force.distance=.4*10*cos180=


remember the dot product means times the cosine of the angle between force and distance. In frictions case, the force opposes the displacement (180 degrees)
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