1. The problem statement, all variables and given/known data A ring on a rod of weight 8 N. A 7 N force at an angle of 45 degrees to the rod is acting away from the ring. The system is in limiting equilibrium. Find the coefficent of friction between the rod and the ring. 2. Relevant equations Quite obvious. 3. The attempt at a solution Could someone explain to me as to why the correct solution is 1.62 and not 0.62? If the former is the case doesn't the COF change everytime a different force is applied?