Answer: Directed toward the axis of rotation.
- A Directed toward the axis of rotation
- B Tangential to the path
- C Along the angular displacement
- D Perpendicular to the radius and in the plane of rotation
Correct answer: A. Directed toward the axis of rotation
Explanation: If force is directed toward the rotation axis (radial), it is perpendicular to displacement, so work = 0.
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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