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==Key Stage 3=====Meaning==='''Unbalanced Forces''' are [[Force]]s acting in opposite directions with different [[magnitude]]s. ===About Unbalanced Forces===: When there are '''unbalanced forces''' on an [[object]] the [[object]] will [[accelerate]].{| class="wikitable"|-|[[File:UnbalancedForces1.png|center|150px]]|[[File:UnbalancedForces2.png|center|200px]]|[[File:UnbalancedForces3.png|center|200px]]|-| style="height:20px; width:200px; text-align:center;" |The 4[[Newton|N]] up and the 7[[Newton|N]] down mean the [[object]] will [[accelerate]] downwards due to a [[Resultant Force|resultant force]] of 3[[Newton|N]].| style="height:20px; width:200px; text-align:center;" |The 4[[Newton|N]] left and the 3[[Newton|N]] right mean the [[object]] will [[accelerate]] to the left due to a [[Resultant Force|resultant force]] of 1[[Newton|N]].| style="height:20px; width:200px; text-align:center;" |The 6[[Newton|N]] up is '''balanced''' by the 6[[Newton|N]] down but the 6[[Newton|N]] left and the 4[[Newton|N]] right mean the object will [[accelerate]] to the left due to a [[Resultant Force|resultant force]] of 2[[Newton|N]].|} ==Key Stage 4=====Meaning==='''Unbalanced forces''' are [[force]][[vector] acting ]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 in opposite a straight line 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.''' Up is 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.''' Right is 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 not positive.''' Right is positive.Up is positive. '''Calculate the [[Resultant Force]]''' There is 38N up and 38N down. F<sub>R</sub> = (+38N) + (-38N) F<sub>R</sub> = 0N upwards The [[vertical]] [[force]]s are [[Balanced Forces|balanced]]. '''Calculate the [[Resultant Force]]''' There is 50N right and 40N left. F<sub>R</sub> = (+50N) + (-40N) F<sub>R</sub> = 10N right The [[equalhorizontal]] in [[magnitudeforce]]s are '''unbalanced'''. |} ===References=======AQA==== :[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Unbalanced forces, pages 118-119, GCSE Physics; Third Edition, Oxford University Press, AQA '']:[https://www.amazon.co.uk/gp/product/0008158770/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158770&linkCode=as2&tag=nrjc-21&linkId=ec31595e720e1529e49876c3866fff6e ''Unbalanced forces, pages 146, 156, 180-1, GCSE Physics; Student Book, Collins, AQA ''] ====Edexcel==== :[https://www.amazon.co.uk/gp/product/1292120223/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1292120223&linkCode=as2&tag=nrjc-21&linkId=068ecf40278c32406a7f1c6e66751417 ''Unbalanced forces, page 13, GCSE Physics, Pearson Edexcel '']