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Friction

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'''Friction''' is a [[force]] resulting from the contact of two surfaces. This force opposes motion.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>. Unlike gravity and electromagnetism, friction is not a [[conservative force]]. For solid bodies, one can distinguish two types of friction:
;[[Static friction]]
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