A 4.540 kg block of wood rests on a steel desk. The coefficient of static friction between the block and the desk is μs = 0.505 and the coefficient of kinetic friction is μk = 0.205. At time t = 0, a force F = 13.8 N is applied horizontally to the block. State the force f(t) of friction applied to the block by the table at times t = 0 and t > 0. f(0) = N f(t > 0) = N Consider the same situation, but this time the external force F is 27.9 N. Again, state the force of friction acting on the block at times t = 0 and t > 0. f(0) = N f(t > 0) = N
