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Newton’s Laws of Motion Friction Friction “Everyone knows about friction but we do not have a fundamental theorem of friction, and cannot predict friction between two surfaces.” Robert Carpick University of Wisconsin-Madison Milwaukee Journal Sentinel July 23, 2006 Friction • Friction is __________ to motion caused by an ___________ with surroundings • The motion is on a surface or through a ___________ medium (e.g., water and air) • Force of static friction, fs, acts on an object when its velocity is ______ • Force of kinetic friction, fk, acts on an object when its velocity is ____ ______ Microscopic View of Friction • May be mechanical in nature • May be electrical in nature Coefficient of Friction, μ • • • • Coefficient of Static Friction, μs Coefficient of Kinetic Friction, μk μk ≤ μs Force of friction is proportional to μ and the ________ force f s s n f k k n Graph of Frictional Force, f