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JAMB Physics 1991 Question 4

Question 4

Motion

An object moves with uniform speed round a circle. Its acceleration has

  1. A.constant magnitude and constant direction
  2. B.constant magnitude and varying direction
  3. C.varying magnitude but constant direction
  4. D.varying magnitude and varying direction.
Show the answer and explanation

Answer: B (constant magnitude and varying direction)

Explanation

The centripetal acceleration v²/r has a fixed size but always points to the centre, so its direction keeps changing.