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→About Friction
: [[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 the motion of an [[object]].
{| 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===