First off, I'd like to say I admire you all very much. At first, I thought I was pretty advanced in physics, and I am at my school. But looking through these forums... damn. Now my question seems stupid I had a problem in my AP Physics class which I just couldn't get. It was related with Torque. (Chapter 9, Page 270, #63 for those who have the 5th Edition Cutnell book). Basically, the problem has a boulder of weight 695.8N on a plank of length 2 meters. The boulder is 1.4 meters from one end. Person A and B support it at each end so that it is horizontal. Person A is nearest the boulder. If weight of the board is negligible, what force does person A apply to the board, and what is the force person B applies to it? I got part of it correct. I found the ratios of the forces by using Tnet=Tcwise+Tccwise. That ended up giving me 0=-F(A)*1.4+F(B)*0.6, which gives me the ratio of FpersonA=2.33FpersonB. Now I don't know how to find the actual forces. A friend of mine in the class just set one of the endpoints as a fulcrum or something, and solved for one of the forces. I didn't understand this at all; I may not even have his basic concept down. Some help would be appreciated. Thanks in advance.