# Newton's Third Law

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Also known as the "Law of Actions and Reaction".  For every action there is an equal and opposite reaction.

## Newton's Third Law formula

 $$\large{ F_1 = -F_2 }$$

### Where:

 Units English Metric $$\large{ F }$$ = force $$\large{lbf}$$ $$\large{N}$$

Tags: Equations for Motion