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JAMB Physics 2000 Question 7

Question 7

Motion

I. Its velocity is constant
II. No work is done on the body.
III. It has constant acceleration directed away from the centre.
IV. The centripetal force is directed towards the centre.
Which combination of the above is true of a body moving with constant speed in a circular track?

  1. A.I and III
  2. B.I and IV
  3. C.II and III
  4. D.II and IV
Show the answer and explanation

Answer: D (II and IV)

Explanation

The direction keeps changing, so velocity is not constant (I false) and acceleration is towards the centre (III false). The force is towards the centre and at right angles to the motion, so it does no work (II, IV true).