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JAMB Physics 1989 Question 4

Question 4

Equilibrium of Forces

The figure above shows a uniform circular object, centre R and diameter PS. A circular section, centre Q and diameter PR is cut away from it. If PQRS is a straight line, where is the centre of gravity of the figure?

Diagram for this question
  1. A.Q
  2. B.R
  3. C.A point between P and R.
  4. D.A point between R and S
Show the answer and explanation

Answer: D (A point between R and S)

Explanation

Removing material on the P side of R shifts the centre of gravity of what is left away from the hole, to a point between R and S.