A block of mass 4kg rests on a horizontal surface for which the coefficients of friction are μs=0.50 and μk=0.30. A horizontal force F is applied to the block.
a. (a) Calculate the value of the limiting friction acting on the block.
b. (b) If F=16N, state whether the block will move. Find the magnitude and direction of the frictional force in this case.
c. (c) If F=25N, determine the acceleration of the block after motion starts.