The force P is applied to the 50-kg block when it is at rest. Determine the magnitude and direction of the friction force exerted by the surface on the block if (a) P = 0, (b) P = 226 N, and (c) P = 353 N. (d) What value of P is required to initiate motion up the incline? The static and kinetic coefficients of friction between the block and the incline are us = 0.30 and uk = 0.27, respectively. The friction force is positive if up the incline, negative if down the incline. 50 kg 24 H, = 0.30 HA=0.27 18 help_outline 50 kg 24 H, = 0.30 HE = 0.27 18