alleryFor a solid cylinder rolling without slipping, the friction force at the contact point:
AIs zero
BActs opposite to motion (kinetic)
CEquals gravity
DActs in direction of motion as static friction
Answer & Solution
Correct answer: D. Acts in direction of motion as static friction
For rolling without slipping, static friction acts at the contact point (which is instantaneously at rest).
For rolling DOWN an incline, friction acts UP the incline (in direction of CM motion) to provide torque about CM.
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