A 2.630kg block of iron rests on a wood desk. The coefficient of static friction between the block and the desk is 0.505 and the coefficient of kinetic friction is 0.355. At time t=0, a force F= 7.98N is applied horizontally to the block. State the force of friction applied to the block by the table at times t=0 and t>0. Consider the same situation as above, but this time the external force F is 16.1N. Again, state the force of friction acting on the block at times t=0 and t>0