# ap Physics

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1.
a)A 15.6 kg block is dragged over a rough, horizontal surface by a constant force of 72.2 N acting at an angle of angle 34.8 above the horizontal. The block is displaced 24.6 m and the coefficient of kinetic friction is 0.234.Find the work done by the 72.2 N force.The acceleration of gravity is 9.8 m/s2 .

b)Find the magnitude of the work done by the force of friction.

c)What is the sign of the work done by the frictional force?
1. negative
2. zero
3. positive

d)Find the work done by the normal force.

e)What is the net work done on the block?

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