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===About Resultant Forces===
: A '''resultant force''' can be calculated by taking [[force]]s that act along the same line and add them together.
: If the [[force]]s are in the same direction as each other, then they have a [[Positive (Number)|positive value]].: If one [[force]] is acting in the opposite direction to another one of the [[force]]s is given a [[Negative (Number)|negative]] value.
{| 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.
|[[File:ForceNumberLineHorizontal.png|center|400px]]
|-
| style="height:20px; width:400px; text-align:center;" |If the 'right' direction is chosen to be [[Positive (Number)|positive]] then any [[vector]] pointing 'right' has a [[Positive (Number)|positive]] value and any [[vector]] pointing 'left' has a [[Negative (Number)|negative]] value.
In this [[diagram]] the blue [[vector]] has a value of +3 while the yellow [[vector]] has a value of -2.
|-
| style="height:20px; width:200px; text-align:left;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Up is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]].'''
F<sub>R</sub> = -3N up
| style="height:20px; width:200px; text-align:left;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Right is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]].'''
F<sub>R</sub> = -1N right
| style="height:20px; width:200px; text-align:left;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Up is [[Positive (Number)|positive]].
Right is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]].'''
|[[File:ResultantForce1.png|center|300px]]
| style="height:20px; width:300px; text-align:center;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Up is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]]'''
|[[File:ResultantForce2.png|center|300px]]
| style="height:20px; width:300px; text-align:center;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Right is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]]'''
|[[File:ResultantForce3.png|center|300px]]
| style="height:20px; width:300px; text-align:center;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Right is [[Positive (Number)|positive]].Up is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]]'''
|[[File:ResultantForce4.png|center|300px]]
| style="height:20px; width:300px; text-align:center;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Right is [[Positive (Number)|positive]].Up is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]]'''