Book: # 2

THE PROCEDURE: 

Attach a cord to the block so that it runs over the pulley and hangs down unobstructed off the edge. Attach a weight pan to the cord. To determine the coefficient of static friction, find the minimum weight needed, hanging in the weight pan, to start the block in motion. The maximum static friction force is equal to
mN = f  where f is the force, (F=ma), of the weight over the pulley. 
Then calculate m. 

To determine the coefficient of kinetic friction, gradually put weights on the pan until the block continues to move with constant velocity when pushed lightly with a finger. Vary the load on the block and repeat the experiment. It will be found that f is proportional to the normal force, N, of the block on the plane.