Work done by centripetal force in circular motion is:
A. Zero
B. Depends on radius
C. Positive
D. Negative
Answer: Option A
Solution (By JKSSB Mock Tests)
Centripetal force acts radially inward, perpendicular to tangential displacement. Work W = F·d·cosθ; θ=90° ⇒ cos90°=0 ⇒ W=0. No energy transfer occurs; speed remains constant in uniform circular motion. Memory tip: 'Perpendicular force ⇒ zero work'. Conceptual question testing work-energy understanding, common in competitive exams to identify misconceptions about circular motion.
Explanation:
Electrostatic force acts between charges at a distance without contact. Gravity, magnetic force also non-contact. Friction and normal require contact.
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