Question

According to the Newton's third law of motion, action and reaction pair:
(A) Always act on the same body
(B) Always act on different bodies in opposite directions
(C) Have same magnitude and directions
(D) Act on either body at normal to each other

Answer 1

Hint Newton’s third law stated that if a body applies some force on another body, the reaction force also works in the opposite direction on the first body. In other words, Newton’s third law of motion states that every action gives an equal and opposite reaction.

Complete step-by-step answer:
Newton’s third law states that, when one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.
The above stated law means that in every interaction of two bodies, there is a pair of forces acting on both the two interacting bodies.
The amount of the forces the first body applied on the second body equals the amount of the force the second body indirectly applies to the first body.
The direction of the force on the first body is opposite to the direction of the force on the second body.
This explains how an action gives an equal and opposite reaction, regardless of how and what force is applied by anybody to anybody.
For example, suppose we are hammering a needle into the wall then the other end of the needle from the wall is also applying the same force on the hammer as the hammer is applying to that end of the needle. Both objects will experience some force.

Note The important point to remember is that force always comes in pairs. One force is acting on the object which is applying the force. This force is known as reaction. Other forces will be acting on the second object in which the force is applied. This force is known as reaction.