Couple | Moment of a couple

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Definition of a couple in Mechanics:

In mechanics, a couple refers to two equal and opposite forces, whose line of action is different from a couple. The couple also called a force couple or pure moment. 

Moment of couple
Moment of couple

The perpendicular distance between L and M of the two equal and opposite forces is known as the arm of the couple. The magnitude of the couple is the product of one of the forces and the arm of the couple. 

Mathematically, Moment of couple = LM × F

A little analysis can show that a couple produces no translational motion but a couple produces a body rotation motion that acts on it.

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