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JAMB Physics 1978 Question 11

Question 11

Motion

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

  1. A.mv2/r
  2. B.mr2/v
  3. C.mr/v
  4. D.mv/r2
  5. E.mv/r
Show the answer and explanation

Answer: A (mv2/r)

Explanation

Circular motion needs a centripetal acceleration v²/r, so the force needed is F = mv²/r.