having major issue with this question. 1. The problem statement, all variables and given/known data a wooden crate of mass m= 60 kg sits on the horizontal surface. the coefficient of static friction between the block and the surface is u=0.5 . an external force P = 220 N, is also applied to the block in a direction parallel to the surface. Also an external force F is applied to the block in a direction perpendicular downwards to the surface. A) if the force F = 40 N, what is the magnitude and direction of the frictional force that the surface exerts on the block? B) what is the smallest force F, necessary to hold the block stationary on the surface? variables m = 60kg P = 220N U = 0.5 2. Relevant equations equations Fs<= U*Fn F = ma Fn = mg 3. The attempt at a solution not sure on where to start for part a in this question. but was thinking for part b you let Ff = P so that Ff<= U*Fn+f Ff<= U*mg + f 220<= U*mg + f and then rearrange to solve for f am i on the right track for part b at least???