For example, ice on steel has a low coefficient of friction, while rubber on pavement i. In short, rougher surfaces tend to have higher effective values whereas smoother surfaces have lower due to the friction they generate when pressed together.
There are essentially two kind of coefficients; static and kinetic. The static coefficient of friction is the coefficient of friction that applies to objects that are motionless. The kinetic or sliding coefficient of friction is the coefficient of friction that applies to objects that are in motion. The coefficient of friction is not always the same for objects that are motionless and objects that are in motion; motionless objects often experience more friction than moving ones, requiring more force to put them in motion than to sustain them in motion.
Most dry materials in combination have friction coefficient values between 0. Values outside this range are rarer, but teflon, for example, can have a coefficient as low as 0.
A value of zero would mean no friction at all, which is elusive at best, whereas a value above 1 would mean that the force required to slide an object along the surface is greater than the normal force of the surface on the object. We have written many articles about the coefficient of friction for Universe Today. Listen here, Episode Gravity. Learn more. Ask Question. Asked 4 years, 6 months ago. Active 1 year, 10 months ago. Viewed 2k times. Improve this question. Add a comment. Active Oldest Votes.
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