The forces each of magnitude 10N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4m which is pivoted at its mid point O as shown is fig. 1.30, Determine the magnitude of the resultant moment of forces about the pivot O.

Explanation

The two forces each of 5 N form a couple.
`therefore` Moment of the couple = Either force `xx` Perpendicular distance between the two forces
= `5xx1`
= 5 Nm (anti-clockwise)