Answer: Forward (in direction of motion).
- A Forward (in direction of motion)
- B Backward according to most researchers
- C Zero in the majority of cases studied
- D Depends on the surface as widely reported
Correct answer: A. Forward (in direction of motion)
Explanation: Since ωR > v, the contact point moves backward relative to the floor. Kinetic friction acts forward on the ball (opposing relative slip), accelerating it and decelerating its spin until rolling condition v = ωR is met.
Torque about axis O equals the force F multiplied by the perpendicular distance r⊥ from the axis to the line of action of the force, producing rotation.
Concept context
Moment of inertia, torque, angular momentum, rolling motion. Very high JEE weightage.
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