Question

Two forces each of magnitude 10 N act vertically upwards and downwards respectively at the two ends A and B of a uniform rod of length 4 m which is pivoted at its midpoint O as shown in the figure. Determine the magnitude of resultant moment of forces about the pivot O.

length 4 m which is pivoted at its mid point O as shown in Fig. 1.30. Determine the magnitude of resultant moment of forces about the pivot O.

Answer 1

$F_1=10N,d_1=2m$

So, moment of $F_1$, ${\tau }_1=10\times 2=20Nm$ (Clockwise)

$F_2=10N,d_2=2m$

So, moment of $F_2$, ${\tau }_2=10\times 2=20Nm$ (Clockwise)

Total torque, $\tau =40Nm$ (Clockwise)