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Friction
,→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 the motion of an [[object]]them from sliding against each other.
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