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JAMB Physics 1986 Question 6

Question 6

Equilibrium of Forces

Which of the following is in a neutral equilibrium?

  1. A.A heavy weight suspended on a string
  2. B.A cone resting on its slant edge
  3. C.A heavy-based table lamp
  4. D.The beam of a balance in use.
Show the answer and explanation

Answer: B (A cone resting on its slant edge)

Explanation

A cone lying on its side can roll to any new position and stays there; its centre of gravity neither rises nor falls, so it is in neutral equilibrium.