The two coefficients of friction |
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Static friction The coefficient of static friction, ms, is the ratio of the friction force f, to the normal force N, just before wheel-spin begins. Kinetic friction The coefficient of kinetic friction, mk, is the ratio of the friction force f, to the normal force N, once wheel-spin has been established. |
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A normal force, (N), is
a reaction force. At right, the normal force (N)
is equal and opposite to mg, the weight of the car. The
friction force between the rubber and the road is given by ...
f = mN ... where m is a constant.