![]() ![]() On dry surfaces you might get as high as 0.9 as a coefficient of friction, but driving them on wet roads would be dangerous since the wet road coefficient might be as low as 0.1. If you were an Indianapolis race driver, you would use "slick" racing tires with no tread. The tread design represents an "all weather" compromise. Jones and Childers report coefficients of friction of about 0.7 for dry roads and 0.4 for wet roads. The tread designs channel water away from the bearing surfaces on wet roads to combat the tendency to hydroplane - a condition which allows your car to "ski' on the road surface because you have a layer of water lubricant under all parts of your tire. Many years of research and practice have led to tread designs for automobile tires which offer good traction in a wide variety of conditions. ![]() But like all applications of friction, it has frustrating ambiguities. So the nature of that friction could actually be a matter of life and death. The friction between the tires of your automobile and the road determine your maximum acceleration, and more importantly your minimum stopping distance. Friction and Automobile Tires Friction and Automobile Tires ![]()
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