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A person exerts a horizontal force of 500 N on a box, which also experiences a frictional force of 100 N. How much work is done against friction when the

box moves a horizontal distance of 3 m? (1) 300 J (2) 1200 J (3) 1500 J (4) 1800 J


Negative of the work done by the friction is equal to the work done against friction.

In this case .... .............
work done by friction is:

         -                                             100          X     3          =    -300
(negative                                        (force)            (distance)
of opposite
direction of
force and direction
of movement )

So therefore work done against friction is simply 300J.

So the answer is (1).

0 0 0
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