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: When [[force]]s act in the same direction their [[magnitude]]s are added together.
: When [[force]]s act along the same line but in opposite directions; one is [[Subtraction|subtracted]] from the other.
: When [[force]]s are at [[Right Angle|right angles]] to one another they can be added using [[Pythagoras ' Theorem|Pythagoras ' theorem]] to find the [[magnitude]] of the '''resultant force''' and then [[trigonometry]] can be used to find the direction of the '''resultant force'''.
===Examples===
F<sub>Horizontal</sub> = 8N right
Since there are two [[Resultant Force|resultant forces]] that are [[perpendicular]] they form a [[Right Angle Triangle|right angle triangle]] and their [[hypotenuse]] is the [[magnitude]] of the [[Resultant Force|resultant force]]. This can be found using [[Pythagoras ' Theorem]].
<math>{F_R}^2 = {F_V}^2 + {F_H}^2</math>