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: 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'''.
{| class="wikitable"
|-
|[[File:ForceNumberLineVertical.png|center|200px]]
| style="height:20px; width:300px; text-align:center;" |If the 'up' direction is chosen to be [[Positive (Number)|positive]] then any [[vector]] pointing 'up' has a [[Positive (Number)|positive]] value and any [[vector]] pointing 'down' has a [[Negative (Number)|negative]] value.
In this [[diagram]] the green [[vector]] has a value of +2 while the red [[vector]] has a value of -4.
If the number lines represent the number of [[Newton]]s [[force]] then the [[Resultant Force]] is the two values added together.
F<sub>R</sub> = (+2N) + (-4N)
F<sub>R</sub> = -2N upwards
|}