Resultant of forces
 

     


Resultant

Parallelogram method

$\vec F$ has the same effect thnan $\vec F_1$ and $\vec F_2 $ This is their resultant! We write: $\vec F$ = $\vec F_1\ +\ \vec F_2 $

Tail-to-tail method

This method is useful for finding the resultant of more than 2 forces.