# Forces55.pdf - 2.5.4 Static and kinetic friction Many...

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2.5.4 Static and kinetic friction Many introductory statics textbooks define two different friction coefficients. One value, known as the coefficient of static friction and denoted by s m , is used to model static friction in the equation giving the condition necessary to initiate slip at a contact s T N m < A second value, known as the coefficient of kinetic friction , and denoted by k m , is used in the equation for the force required to maintain steady sliding between two surfaces k T N m = ± I don’t like to do this (I’m such a rebel). It is true that for some materials the static friction force can be a bit higher than the kinetic friction force, but this behavior is by no means universal, and in any case the difference between k m and s m is very small (of the order of 0.05). We’ve already seen that m can vary far more than this for a given material pair, so it doesn’t make much sense to quibble about such a small difference.
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