Question

Calculate the resultant moment of forces about the point B.

• A. 10 Nm
• B. 5 Nm
• C. 8 Nm
• D. 20 Nm

Answer 1

The correct option is A

10 Nm

We know that,
Moment of force = Force $\times$ Perpendicular distance between axis of rotation and line of action of force
Force $F$ = $10N$

Perpendicular distance between axis of rotation and line of action of force at A $\left(r_1\right)$ = $1m$

Perpendicular distance between axis of rotation and line of action of force at B $\left(r_2\right)$ = $0$

Moment of force(A) $=\text{Force}\times r_1$
$=10N\times 1m$
$=10N\times 1m$
= $10Nm$ (clockwise)

Moment of force(B) $=Force\times r_2$

$=10N\times 0m$ = $0Nm$

Resultant torque =$10Nm$ (clockwise)