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===About Friction===
: [[Friction]] is a [[Contact Force|contact force]] because it only exists when two surfaces are touching.
===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 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.
|}