1. The problem statement, all variables and given/known data I am given a right triangle with a block on it. At angle 18degrees the block does not move. At angle 19degrees the block starts sliding down the ramp. I am given no other information but I am told to find μS. The forces acting on the block are going to be Fn opposite the angle the block is sitting on, mgsin(theta) pointed downwards, F->, and the static friction pointed <- (Opposite the force). 2. Relevant equations 3. The attempt at a solution When it starts moving fS is going to be at its maximum correct? And fs = μS*Fn. Can I get a number for this considering I am only given the angle? Since the block is moving it has already broken through the maximum static friction force so does μS become 0 and the frictional force all becomes kinetic?