### Topic Content:

- Definition of Couple
- Applications of Torque

A couple is a system of two equal and parallel but opposite forces not acting in a straight line. This system of forces in parallel can cause a body to rotate and not move in a straight line (linearly).

The **moment of a couple** is the product of one of the forces and the perpendicular distance between the lines of action of the two forces.

From Fig. 1 above;

Moment of a couple = Force Ã— perpendicular distance

Moment = F Ã— d

Moment = F Ã— 2r

where r is the radius of the wheel and d is its diameter.

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