1. The problem statement, all variables and given/known data A 200N block is on a 35 degree incline with a frictionless, massless pulley and a weight on the other side, Fw= 220. The system is in equilibrium. What are the magnitude and direction of the frictional force on the 200N block? 2. Relevant equations and 3. The attempt at a solution Ft1 + Ft2 = Fw , so Ft1 and Ft2 are 220N Fn= 20.4 sin 35 * 9.8 = 112.4 I guess Fw-Fn = Ff, but I don't understand why. Is that always true? So the answer here would be 108 in regard to the magnitude, though the book wants 105. I guess that's a rounding thing? And it says down the incline, but why?