Changes

==Key Stage 3=====Meaning===[[Lubrication]] is when a [[substance]] is added to a surface to reduce [[friction]]. ===About Lubrication===: When a '''lubricant''' is added to a surface the surface becomes more 'slippery'. This means the [[lubricantfriction]] between that surface and another has decreased. ==Key Stage 4=====Meaning===[[Lubrication]] is when a [[substance]] is added to a surface to reduce [[friction]] . ===About Lubrication===: When a '''lubricant''' is added to the boundary between two surfaces the [[friction]] is decreased.: [[Lubricating Oil]] is a fraction of [[Crude Oil]] often used as [[lubrication]].: When two surfaces rub together the [[friction]] causes [[energy]] to be [[Energy Transfer|transferred]] to the [[Thermal Energy Store|thermal energy store]] of the [[object]]s. [[Lubrication]] of the surfaces reduces the unwanted [[Energy Transfer|energy transfer]] reducing the [[heating]] effect caused when two surfaces rub together.: Drills often use [[water]] or [[Lubricating Oil|oil]] to '''lubricate''' the surfacewhich helps prevent the drill from getting too hot and [[melting]].