For a body moving with constant speed in a horizontal circle, which of the following remains constant?
- AVelocity
- BAcceleration
- CCentripetal force
- DKinetic energy
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (d) Kinetic energy
Explanation
In uniform circular motion the speed stays the same, so the kinetic energy, ½mv², stays constant.
Velocity, acceleration and centripetal force are vectors whose directions keep changing as the body goes round, so they do not stay constant.