- 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 × perpendicular distance
Moment = F × d
Moment = F × 2r
where r is the radius of the wheel and d is its diameter.
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