Current Attempt in Progress The 61-lb force P is applied to the 170-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume us = 0.43, MK = 0.32. P HK Answer: F = i Ib