Newton's Third Law

N(III) in words
If object X applies a force onto object Y, then object Y simultaneously applies the same size force back onto object X.


For every force or action , there is an equal but opposite force or reaction.

N(III) is applicable in all situations, whether an object is:

Important Points

Some Examples

If You Slap Yourself

Two Trolleys Moving Apart

Two trollets are held as shown, with a compressed spring in an isolated system.

The trolleys are simultaneously released.

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