Answer: ω > √(μg/r).
- A ω > √(μg/r)
- B ω < √(μg/r)
- C ω = μg/r
- D ω > μgr
Correct answer: A. ω > √(μg/r)
Explanation: Static friction provides centripetal force: μmg ≥ mω²r. Sliding occurs when ω²r > μg, i.e., ω > √(μg/r).
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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