A body moving with constant speed in a circle has
Correct answer: C. changing velocity and therefore acceleration
- A. constant velocity
- B. zero acceleration
- C. changing velocity and therefore acceleration
- D. no force acting on it
Explanation
Velocity is a vector, so a continuous change of direction is a change of velocity even at constant speed, and the acceleration points towards the centre. A net force must therefore act, supplied by tension, friction or gravity depending on the situation. Constant speed and constant velocity are not the same thing.
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About Acceleration
Acceleration measures the rate at which velocity changes with time, including changes in speed, direction or both. Work includes average and instantaneous acceleration, the relation a = Δv/Δt, uniform acceleration equations, and interpreting velocity time and displacement time graphs, with acceleration carefully distinguished from velocity.
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