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==Key Stage 2==
===Meaning===
'''Friction''' is a [[force]] that slows things down when two [[Surface|surfaces]] are touching each other.
: Singular [[Noun]]: '''Friction'''
: Plural [[Noun]]: '''Friction'''
: [[Friction]] is a [[force]] so it is [[Measure|measured]] in [[Newton]]s.
: [[Friction]] is a [[Contact Force|contact force]] because it only exists when two surfaces are touching.
: [[Friction]] occurs because two [[Roughness|rough]] surfaces have bumps that fit together resisting them from sliding against each other.{| class="wikitable"|-|[[File:SurfacesFriction.png|center|400px]]|-| style="height:20px; width:200px; text-align:center;" |The two [[diagram]] shows two [[roughness|rough]] surfaces and two [[roughness|smooth]] surfaces. The [[friction]] between the [[roughness|rough]] surfaces is greater because there are more bumps in the way to prevent the surfaces sliding against each other.|} ===Examples==={| class="wikitable"|-|[[File:FrictionBowlingBall.png|center|200px]]|[[File:FrictionCar.png|center|300px]]|-| style="height:20px; width:300px; text-align:center;" |'''Friction''' acts at the point where the bowling ball touches the ground. The [[force]] of [[friction]] acts to [[decelerate]] the bowling ball as it moves.| style="height:20px; width:300px; text-align:center;" |'''Friction''' acts at the point that the tyres touch the motion ground. The [[force]] of [[friction]] can act to [[decelerate]] the car but can also be use to [[accelerate]] the [[car]]. If there was no [[friction]] the wheels would spin but the [[car]] would not [[accelerate]]. |} ==Key Stage 3=====Meaning==='''Friction''' is a [[force]] that acts prevent two surfaces from sliding over one another. ===About Friction===: [[Friction]] is a [[force]] so it is [[Measure|measured]] in [[Newton]]s.: [[Friction]] is a [[Contact Force|contact force]] because it only exists when two surfaces are touching.: [[Friction]] occurs because two [[Roughness|rough]] surfaces have bumps that fit together resisting them from sliding against each other.{| class="wikitable"|-|[[File:SurfacesFriction.png|center|400px]]|-| style="height:20px; width:200px; text-align:center;" |The two [[diagram]] shows two [[roughness|rough]] surfaces and two [[roughness|smooth]] surfaces. The [[friction]] between the [[roughness|rough]] surfaces is greater because there are more bumps in the way to prevent the surfaces sliding against each other.|}: [[Friction]] can act to [[decelerate]] an [[object]]sliding along a surface. However, it also allows [[object]]s with a [[Driving Force|driving force]] to [[accelerate]] by preventing a wheel from sliding against the surface.: The [[friction]] between two surfaces can be reduced with a [[lubricant]] which keeps the rough parts of two surfaces separated.{| class="wikitable"|-|[[File:LubricantFriction.png|center|400px]]|-| style="height:20px; width:200px; text-align:center;" |The two [[diagram]] shows how [[roughness|rough]] surfaces can be separated by a [[lubricant]] reducing the [[friction]] between them.|}
===Energy Transfer===
: When two surfaces slide over one another [[Work Done|work]] is done by [[friction]] to [[Mechanical Energy Transfer|transfer]] [[energy]] from the [[Kinetic Energy Store|kinetic energy store]] to the [[Thermal Energy Store|thermal energy store]] of the [[system]].
===Examples===
| style="height:20px; width:300px; text-align:center;" |'''Friction''' acts at the point where the bowling ball touches the ground. The [[force]] of [[friction]] acts to [[decelerate]] the bowling ball as it moves.
| style="height:20px; width:300px; text-align:center;" |'''Friction''' acts at the point that the tyres touch the ground. The [[force]] of [[friction]] can act to [[decelerate]] the car but can also be use to [[accelerate]] the [[car]]. If there was no [[friction]] the wheels would spin but the [[car]] would not [[accelerate]].
|}