A uniform solid cylinder is released from rest at the top of a rough incline and…
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Energy and Momentum of Rotating Systems · Energy and Momentum of Rotating Systems
Problem
A uniform solid cylinder is released from rest at the top of a rough incline and accelerates down the slope while rolling without slipping. Which statement best describes the direction of the static friction force acting on the cylinder during its motion?
(a) Downslope, because friction always opposes the direction of motion.
(b) Zero, because no friction is needed once rolling has begun.
(c) Upslope, because the force is required to increase the cylinder’s angular speed.
(d) Upslope, because the surface must slow the translational motion of the center.