Answer: only rotation.
- A only translation
- B translation and rotation
- C only rotation
- D no motion
Correct answer: C. only rotation
Explanation: A couple is two equal and opposite forces with different lines of action; the net force is zero (no translation) but the net torque is non-zero, giving pure rotation.
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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