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Action and Reaction Forces

Newton’s I law of motion gives us the definition of force and the II law gives us the method of measuring force. The III law describes the relationship between the forces of interaction between two bodies.

The mutual influence between any two bodies through a force is called interaction.



The force exerted by one of the bodies on the other is called ‘action’.



while the force exerted by the other on the first is called ‘reaction’.

In an action-reaction pair of forces any one can be called the action and the other will be the reaction. Action and reaction act simultaneously but on different bodies. They are equal in magnitude but opposite in direction and since they act on two different bodies they do not cancel each other.


Example : if you hit a ball using your hand, the applied force to the ball is the 'action' and at the same time your hand will experience some amount of equal and opposite force from the ball, which is the 'reaction'.  

The baseball forces the bat to the left (an action); the bat forces the ball to the right (the reaction). Note that the nouns in the sentence describing the action force, switch places when describing the reaction force.



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