Question

Work done by friction on a block in one revolution

Answer 1

A small block with mass 0.0425kg slides in a vertical circle of radius 0.400m on the inside of a circular track. During one of the revolutions of the block, when the block is at the bottom of its path, the magnitude of the normal force exerted on the block by the track has magnitude 4.00N. In this same revolution, when the block reaches the top of its path, the magnitude of the normal force exerted on the block has magnitude on 0.670 N.