A body moving with constant speed in a circle has
- 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.
Related questions
A car accelerates uniformly from rest to 20 m s-1 in 8 s. The distance covered is
A stone is dropped from rest and falls freely for 3 seconds. Taking g as 10 m per second squared, the distance fallen is
A car accelerates uniformly from 10 m per second to 30 m per second in 5 seconds. Its acceleration is