1. The problem statement, all variables and given/known data Homogeneous cube with one edge lying on the floor and the other on a smooth vertical wall. The underside of cube with a horizontal surface makes angle of π6 .What is the value to the coefficient of friction between the cube and the floor to cube remain in balance. 2. Relevant equations ∑F=0 ∑M=0 M=rF M is momentum of force. 3. The attempt at a solution In static case ∑F=0 ∑M=0 I need help to write this equation from the problem statement. I don't have idea. Because cube is homogenuous the forces are equal from all parts I suppose. . Do you have any idea? I think this goes in one line but it is hard for me. Tnx for your answer.