1. The problem statement, all variables and given/known data In the picture 2. Relevant equations Torque = I * Alpha Alpha = a / r Fnet = m*a 3. The attempt at a solution I provided my work in the pictures. I figured out that the frictional force in system B is greater than in system A. I am not sure how to compare this with the frictional force from system C. I figured out the sum if the frictional forces of A and B are equal to mg sin theta, but don't know how the two compare.