Physics
Prove that
Moment of couple = Force x Couple arm.
Force
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Answer
At point A and point B two forces act which rotate the bar in anticlockwise direction.
The perpendicular distance between the two forces called AB is the couple arm.
Moment of force F at A = F x OA (anticlockwise)
Moment of force F at B = F x OB (anticlockwise)
Total moment of couple = F x OA + F x OB
F x (OA + OB) = F x AB
= F x d
Hence proved : Moment of force = Force x Couple arm
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