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During uniform circular motion, the magnitude of which quantity remains constant?
ASpeed
BVelocity
CAcceleration vector
DNet force
Answer & Solution
Correct answer: A. Speed
1. In uniform circular motion (UCM) the particle moves with constant speed along a circular path.
2. Velocity is tangential and changes direction at every instant, so the velocity vector is NOT constant.
3. The centripetal acceleration has constant magnitude but its direction (towards the centre) keeps rotating.
4. Hence only the scalar speed is conserved.
_Source: Maharashtra Balbharati Std XII Physics, Ch 1 "Rotational Dynamics" §1.2.1_
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