Question

The figure shows two forces each of magnitude 10 N acting at the point A and B at a separation of 50 cm, in opposite directions. Calculate the resultant moment of two forces about the point.

1. A,
2. B and
3. O situated exactly at the middle of the two forces.

Answer 1

Moments of force = Force × distance

F = 10 N at A and B

distance between them = 50 cm

= `50/100`

= 0.5 m

i. Moment of force at A = 10 × 0.5

= 5 N m (clockwise)

ii. Moment of force at B = 10 × 0.5

= 5 N m (clockwise)

iii. Moment of force at O = 2.5 + 2.5

= 5 N m (clockwise)