A cylinder with moment of inertia I, mass M, and radius r is being pulled by a string with a tension T.
What is the acceleration of the cylinder? What is the force of friction?
Fnet = M*a = T - f
Torque = I*(a/r) = f*r
The Attempt at a Solution
So a = f*r^2/I
And M*(f*r^2/I) = T- f.
What I don't understand is how "f" (friction) slows the cylinder. It is just causing rotation, not acting on the center of mass. I thought my professor said that rolling friction doesn't slow things down...