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===About Friction===
: '''Friction ''' can only happen when two surfaces are touching so it is called a "[[Contact Force]]".: '''Friction ''' depends on the [[texture]] of a surface.
: The rougher a surface is, the more '''friction''' an object will experience when it is moving.
: The smoother a surface is, the less '''friction''' an object will experience.
: A surface could be described as high '''friction''' or low '''friction'''.