Question

A couple produces-
(A) Linear motion
(B) Rotational motion
(C) Both A and B
(D) Neither A nor B

Answer 1

Hint
We know that a force is a push or pull upon an object resulting from the object's interaction with another object. Whenever there is an interaction between two objects, there is a force upon each of the objects. When the interaction ceases, the two objects no longer experience the force. When a force acts (pushes or pulls) on an object, it changes the object's speed or direction (in other words, makes it accelerate). The bigger the force, the more the object accelerates. When a force acts on an object, there's an equal force (called a reaction) acting in the opposite direction.

Complete step by step answer
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, but only rotational motion.
The resultant force generated from a couple is always zero. However, the resultant is not zero as it is a moment.
Therefore, the correct answer is Option (B).

Note
Thus, we can say that a force couple is defined as two equals but oppositely directed forces acting simultaneously on opposite sides of an axis that generates rotation. In mechanics, a couple is a system of forces that results in a moment without a resultant force and creates a rotation without translation. 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. For example, the forces that two hands apply to turn a steering wheel are often or should be a couple.