For 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.
Related questions
A bicycle wheel of radius $R$ rolls without slipping at linear speed $v$. The angular speeAn ice skater spinning with arms outstretched at $\omega_1$ pulls arms in, halving her momA solid disc of mass $M$, radius $R$, rotating about its centre axis has moment of inertiaA child pushes a door of width $0.8$ m perpendicular to the door at the handle with $20$ NMoment of inertia of an annular disc (inner radius r1, outer r2) about perpendicular axis A merry-go-round (I = 1000 kg m²) rotates at 0.5 rad/s. A 50 kg child runs and jumps onto A solid cylinder (I = MR²/2) of mass 2 kg, radius 0.1 m, rolls without slipping at 6 m/s. For a body rotating at constant angular velocity omega, the linear speed at distance r fro