How much horizontal pushing force is necessary to hold a block of mass m = 22 kg against a vertical wall without it falling down? The wall/block interface has a coefficient of static friction of ?s = 0.4.
A hockey player strikes a 166 g puck, accelerating it from rest to 48 m/s. If the hockey stick is in contact with the puck for 2.5 ms, what is the average force applied by the stick?