# Sta2c fric2on unless the car is skidding also have the

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Unformatted text preview: wton’s Laws to each object •  Solve the equa2ons Mul2ple Objects – Example, cont. Forces of Fric2on •  When an object is in mo2on on a surface or through a viscous medium, there will be a resistance to the mo2on –  This is due to the interac2ons between the object and its environment •  This resistance is called fric-on More About Fric2on •  Fric2on is propor2onal to the normal force •  The force of sta2c fric2on is generally greater than the force of kine2c fric2on •  The coeﬃcient of fric2on (µ) depends on the surfaces in contact •  The direc2on of the fric2onal force is opposite the direc2on of mo2on •  The coeﬃcients of fric2on are nearly independent of the area of contact Sta2c Fric2on, ƒs •  Sta2c fric2on acts to keep the object from moving •  If F increases, so does ƒs •  If F decreases, so does ƒs •  ƒs ≤ µs n –  Use = sign for impending mo2on only Kine2c Fric2on, ƒk •  The force of kine2c fric2on acts when the object is in mo2on •  ƒk = µk n –  Varia2ons of the coeﬃcient with speed will be ignored Some Coeﬃcients of Fric2on...
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## This document was uploaded on 01/14/2014.

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