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# chapter4.6_slide - 9/23/2009 Friction: The resistance an...

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9/23/2009 1 Friction: The resistance an object experiences when moving on a surface or through a viscous medium Friction is not necessarily a bad thing It is important! Without friction, we would not be able to - walk or drive (think about the slippery icy road) - grip and hold things … Not enough friction With friction What causes friction? A hard question, actually. - Roughness of contact surface: less friction on smoother contact surfaces - Normal force: easier to push forward lighter objects Example: Pulling a crate - Before pulling the crate, no friction force on the crate - Start pulling with a small force the crate may not move Magnitude of friction force = Tension Opposite in direction - Pull harder, the friction force on the crate grows, until it reaches a maximum - The crate will then start moving

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9/23/2009 2 The maximum friction force: coefficient of static friction normal force Therefore, before the object moves, Note that F and fs are always opposite in direction F s f n s s F f max , mg n F : s : n F max , s s s f f f F
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## This note was uploaded on 01/02/2010 for the course PHY 101 taught by Professor Pralle during the Spring '08 term at SUNY Buffalo.

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chapter4.6_slide - 9/23/2009 Friction: The resistance an...

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