Newton’s Third Law and Action-Reaction Pairs – Rankers Physics
Topic: Laws of Motion
Subtopic: Third Law of Motion

Newton’s Third Law and Action-Reaction Pairs

Assertion (A): According to Newton's third law of motion, action and reaction forces are equal in magnitude and opposite in direction.
Reason (R): Net force on a body due to action-reaction pair is always equal to zero.
 
(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)
(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(3) (A) is true but (R) is false
(4) Both (A) and (R) are false

Solution:

Assertion (A) is true: Newton's third law states that action and reaction forces are always equal in \(magnitude\) and opposite in \(direction\).nReason (R) is false: Action and reaction forces act on *different* bodies, so they cannot cancel each other out to produce a net force of \(0\) on a *single* body. Therefore, (A) is true but (R) is false.

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