1. The problem statement, all variables and given/known data Two masses are connected by an inelastic string over a frictionless pulley. M1 is 4 kg and the coefficient of static friction between M1 and the inclined plane Us = 0.25. What minimum and maximum amount of mass can M2 have so that M1 remains stationary on the plane? (In the given picture θ equals 30 degrees. 2. Relevant equations F1y = F1 Sin 30 F1y = F1 sin 30 = mg F1 = mg / sin30 3. The attempt at a solution Im having an extremely difficult time understanding the concept of pulleys with forces. Am i simply taking the 4kg / cos 30 degrees = 5.0N and then taking 5.0N Sin 30 Degrees? Im very lost and dont understand where the coefficient of friction plays a role! Please help!