Couple

Topic Content:

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. 5.1.1 above;

• Moment of a couple = Force × perpendicular distance
• Moment = F × d
• Moment = F × 2r