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2.5. MOMENTS AND COUPLES

2.5.1 Moment. The moment is the product of the force and the perpendicular distance between the line of action of the force and the point about which moment is to be taken.

2.5.2. Couple. When two equal and opposite parallel forces act on a body at some distance apart, the two forces from a couple as shown in Fig.2.27. This couple has the tendency to rotate the body. The perpendicular distance between the parallel forces is known as arm of the couple. The moment of the couple is the product of either one of the forces and perpendicular distance between the forces.

Fig.2.27