JAMB Physics 2009 Objective — Question 8

Question 8 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2009 Objective paper, with the correct answer and a full explanation.

8. The diagram shows plank RS pivoted at its centre of gravity O, in equilibrium with weights P and Q. If a weight 2P is added to P, the plank can be restored to equilibrium by

A. moving O nearer to P
B. moving Q nearer to OCorrect
C. adding weight to Q
D. moving P further away from O

Explanation

Adding 2P to P increases the anticlockwise moment. To restore equilibrium, the clockwise moment from Q must be increased commensurately, which is achieved by moving Q nearer to O (reducing its distance while its moment about O increases relative to the new load) — moving P further away is not valid since P and Q's values are not given as adjustable that way.

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