Newton's Third Law Of Motion


Force is a push or pull acting on an object resulting in its interaction with another object. Force is a result of an interaction. Force can be classified into two categories: contact force such as frictional force and non-contact force such as gravitational force. According to Newton, when two bodies interact, they exerted force on each other and these forces are known as action and reaction which is explained in Newton’s third law of motion.

Newton’s Third Law Of Motion

Newton’s third law of motion states that

When one body exerts force on the other body, the first body experiences a force which is equal in magnitude in the opposite direction of the force which is exerted.

The mathematical representation of Newton’s third law of motion is let A be the body exerting force \(\vec{F}\) on the body B, then body B too exerts a force \(-\vec{F}\) on body A, which is given as:


Newton’s third law of motion is associated with conservation of momentum. According to the law, for every action there must be an equal and opposite reaction.

Newton’s Third Law Of Motion Formula

Following is the formula of Newton’s third law of motion:


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Newton’s Third Law Of Motion Examples

Examples of Newton’s 3rd law of motion are as follows:

  • Lift is created by helicopters by pushing the air down, thereby creating an upward reaction force.
  • A swimmer pushing herself or himself against the offside of the pool to move forward.
  • Rock climbers pulling their vertical rope downwards so as to push themselves upwards.

1 Comment


    Thanks for explaining 🤗

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