A 2.0 kg block rests on a level surface. The coefficient of static friction is , and the coefficient of kinetic friction is A horizontal force, X, is applied to the block. As X is increased, the block begins moving. Describe how the force of friction varies as X 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 X before the block starts moving, at the point it starts moving, and after it is moving. Show your work.