Force p is applied to the 67-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 = 236 n, and (c) p = 370 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 μs = 0.23 and μk = 0.20, respectively. the friction force is positive if up the incline, negative if down the incline.