Question

WHAT IS COUPLE FORCE?​

Answer 1

Answer:

In mechanics, a couple refers to two parallel forces that are equal in magnitude, opposite in sense and do not share a line of action.

In mechanics, a couple refers to two parallel forces that are equal in magnitude, opposite in sense and do not share a line of action.A better term is force couple or pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass. In rigid body mechanics, force couples are free vectors, meaning their effects on a body are independent of torque. This is not to be confused with the term torque as it is used in physics, where it is merely a synonym of moment Instead, torque is a special case of moment. Torque has special properties that moment does not have, in particular the property of being independent of reference point,

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Answer 2

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Here is your answer.. :)

              Two forces of equal magnitude and opposite direction whose line of action is not same is said to constitute couple.

Explanation:

A special case of moments is a couple. A couple consists of two parallel forces that are equal in magnitude, opposite in sense and do not share a line of action. It does not produce any translation, only rotation. The resultant force of a couple is zero. BUT, the resultant of a couple is not zero; it is a pure moment.

For example,

              the forces that two hands apply to turn a steering wheel are often (or should be) a couple. Each hand grips the wheel at points on opposite sides of the shaft. When they apply a force that is equal in magnitude yet opposite in direction the wheel rotates. If both hands applied a force in the same direction, the sum of the moments created by each force would equal zero and the wheel would not rotate. Instead of rotating around the shaft, the shaft would be loaded with a force tending to cause a translation with a magnitude of twice F. If the forces applied by the two hands were unequal, there would again be an unbalanced force creating a translation of the "system." A pure couple always consists of two forces equal in magnitude.