Fig. 1.31 shows two forces each of magnitude 10 N acting at the points A and B at a separation of 50 cm, in opposite directions, Calculate the resultant moment of the two forces about the point (i) A, (ii) B and (iii) O situated exactly at the middle of the two forces.

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Solution

(i) A
moment(m)=force $\times$ distance
=10 $\times$ 0.5= 5 Nm clockwise direction

(ii) B
moment=10 $\times$ 0.5= 5 Nm clockwise direction

(iii) O situated exactly at the middle of the two forces.

Moment=10 $\times$ 0.25+10 $\times$ 0.25= 5Nm clockwise direction

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