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| style="height:20px; width:200px; text-align:center;" |The 4[[N]] left and the 3[[N]] right mean the [[object]] will [[accelerate]] to the left due to a [[Resultant Force|resultant force]] of 1[[N]].
| style="height:20px; width:200px; text-align:center;" |The 6[[N]] up is '''balanced''' by the 6[[N]] down but the 6[[N]] left and the 4[[N]] right mean the object will [[accelerate]] to the left due to a [[Resultant Force|resultant force]] of 2[[N]].
|}
==Key Stage 4==
===Meaning===
'''Unbalanced forces''' are [[force]] [[vector]]s which add together to make a (non-zero) [[Resultant Force|resultant force]].
===About Balanced Forces===
: When [[force]]s on an [[object]] are '''unbalanced''' it will [[accelerate]] (change speed or direction).
: '''Unbalanced forces''' are related to [[Newton's First Law]] of [[motion]]:
:: An [[object]] in motion will tend to stay in motion and an [[object]] at [[rest]] will tend to stay at [[rest]] unless an [[Unbalanced Forces|unbalanced force]] acts upon it.
: If the [[Resultant Force|resultant force]] on an [[object]] is not zero, then the [[force]]s are '''unbalanced'''.
===Examples===
{| class="wikitable"
|-
|[[File:ResultantForce1.png|center|200px]]
|[[File:ResultantForce2.png|center|200px]]
|[[File:ResultantForce3.png|center|200px]]
|-
| style="height:20px; width:200px; text-align:center;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Up is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]]'''
There is 29N up and 37N down.
F<sub>R</sub> = (+29N) + (-37N)
F<sub>R</sub> = -8N upwards
The [[force]]s are '''unbalanced'''.
| style="height:20px; width:200px; text-align:center;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Right is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]]'''
There is 114N right and 105N left.
F<sub>R</sub> = (+114N) + (-105N)
F<sub>R</sub> = 9N right
The [[force]]s are '''unbalanced'''.
| style="height:20px; width:200px; text-align:center;" |
'''Choose which directions are [[Positive (Number)|positive]].'''
Right is [[Positive (Number)|positive]].
Up is [[Positive (Number)|positive]].
'''Calculate the [[Resultant Force]]'''
There is 38N up and 38N down.
F<sub>R</sub> = (+38N) + (-38N)
F<sub>R</sub> = 0N upwards
'''Calculate the [[Resultant Force]]'''
There is 50N right and 40N left.
F<sub>R</sub> = (+50N) + (-40N)
F<sub>R</sub> = 10N right
The [[horizontal]] [[force]]s are '''unbalanced'''.
|}