Question

Calculate Moment of force $$F_1$$ about $$O$$.

A
10N m (clockwise)
B
10N m (anti clockwise)
C
15N m (clockwise)
D
15N m (anticlockwise)

Solution

The correct option is B $$10N$$ $$m$$ (anti clockwise)As we have to find the moment of force about O with respect to first force for which the perpendicular distance is $$2 m$$. We have a magnitude of force $$5 N$$. We know that moment of force given by formula $$r \times F = 2\times5\ N-m$$.Hence there is a magnitude of $$10 N-m$$ moment of force.If the fingers of the right hand are curled from the direction of r towards the direction of F then the thumb points the direction of torque. Hence it is anti-clockwise in direction with $$10 N-m$$.Physics

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