A horizontal force F of 12 lb pushes a block weighing 5.0 lb against a vertical wall. The coefficient of static friction between the wall and block is 0.60 and the coefficient of kinetic friction is 0.40. assume the block is not moving initially. (a) Will the block start moving? (b) What is the force exerted on the block by the wall? F = ma, Ff=usN I don't know what isn't clicking, but apparently the object is NOT moving. My attempt is as follows; The object is about to break when usN = mg. Since N = mg, usmg = mg. However, (0.6)(12) [tex]\neq[/tex] 5.