Distinguish between principle of moments and moment of a couple as applied to co-planar forces

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The principle of momentsstates that the sum of the clockwise moments (also known as torques) about a point must be equal to the sum of the counterclockwise moments about the same point in order for an object to be in equilibrium. This principle is commonly expressed as the following equation:clockwise moments = counterclockwise moments

The principle of moments is based on the concept of moment, which is defined as the product of the force applied to an object and the perpendicular distance between the line of action of the force and the point about which the moment is being calculated. The principle of moments states that if an object is in equilibrium, the sum of the moments acting on the object must be zero.

Moment of a couple,used to describe the effect of two forces that are applied to an object at different points, but which produce the same moment about a given point. A couple is a pair of forces that are equal in magnitude, but opposite in direction, and which act on an object at different points. The moment of a couple is equal to the product of the magnitude of the forces and the perpendicular distance between the points at which the forces are applied.