1. The problem statement, all variables and given/known data Calculate the force P that is required to hold the 120lb roller at rest on the rough incline. (see attachments for Free body diagram) 2. Relevant equations Summation of Forces X = 0 Summation of Forces Y = 0 Summation of Moment along A = 0 Moment = Fd 3. The attempt at a solution well here's what i did... Summation of moment along A = 0 [clockwise = positive] -4(Psin15) + 4Pcos15 - 4(120sin15) = 0 P = 4(120sin15) / 4cos15 -4sin15 P = 43.923 lb Which is wrong.. I've found out that the correct answer is 53.6lb Can someone explain to me? on where did I go wrong.