1. The problem statement, all variables and given/known data http://imageshack.us/a/img812/8836/5tfn.jpg [Broken] Uploaded with ImageShack.us Find F such that the moment around A will not exceed 1000N*m for any value of θ. 2. Relevant equations M = fd 3. The attempt at a solution I got the right answer, I found the distance of a -> b AB= √( (2^2) + (3^2) ) AB=3.6 and then I did M = fd 1000 = f (3.6) f = 277.8 N This is correct according to the answer in the back, but I don't understand why. 1. I was under the impression for: M = fd , d must be the perpendicular distance. Clearly, the d we are using is not perpendicular to f. Does d not have to be perpendicular to the force? 2. I thought this was a trick question at first, and logically I thought it made most sense that the greatest moment around A would be caused by a force only in the vertical direction. So I tried doing it where Fx = 0 and Fy is the variable of interest. So i tried, M = (Fy)d 1000 = (Fy)(3) but the fy I get is clearly not the answer. Can someone explain this to me.