2. A 2.0 kg block rests on a level surface. The coefficient of static friction is us = 0.60, and the coefficient of kinetic friction is uk = 0.40 A horizontal force, F, is applied to the block. As F is increased, the block begins
moving. Describe how the force of friction varies as F increases from the moment the block is at rest to when it begins moving. Indicate how you could determine the force of friction at each value of F-before the block starts moving, at the point it starts moving, and after it is moving. Show vour work.