Question

2
b Define
couple and
write
its characteristics​

Answer 1

If there are two forces which are equal and opposite they form a couple. Couple: When two forces of equal magnitude opposite in direction and acting along parallel straight lines, then they are said to form a couple. The perpendicular distance between the two force forming a couple is called the arm of the couple

The main characteristics of couple:

1. The algebraic sum of the forces, having the couple, is zero.

2. The algebraic sum of moment of the forces, constituting couple, about any point is the same, and equal to the moment of couple itself.

3. A couple can't be balanced by a single force, but can be balanced only by a couple, however of opposite sense.

4. Any number of coplanar couples can be reduced to single couple, whose magnitude will be equal to algebraic sum of moments of all the couples.

Hope it helps you...