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Discussion and Debate
Discussion and Debate
Physical & Life Sciences
Not Slippery When Wet
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<blockquote data-quote="Ponderous Curmudgeon" data-source="post: 76122137" data-attributes="member: 433179"><p>Agreed, far from original but I think the real problem is Chesterton seems to be assuming that the locked tire is due to the wetness of the road when in fact that is only part of the situation.</p><p>My summary;</p><p></p><p>Friction between tire and road is decreased by the presence of water on the road due to water between the tire and the road and the shear in water layers. This is the case whether the tire is rolling or not and the main cause of "slipperiness" as we generally think of it.</p><p></p><p>Rolling friction (static friction)when the tire is rotating is greater than sliding (kinetic) friction when the tire is locked. Confusion here because static and kinetic seem to be the opposite from rolling and sliding, but the reference is to the contact patch and whether it is moving relative to the road surface contact patch.</p><p></p><p>If the forces on the tire exceed the frictional static force on the tire either due to braking or excessive power to the wheel, you shift to the kinetic mode. If due to braking, you skid and leave a black mark, if due to engine power, you have a burnout and leave rubber on the road that way. But in both cases water on the road will decrease friction further.</p><p></p><p></p><p>Finally tire design, agree, tires are elastic and designed to optimize contact patch to little pressure and patch increases in size and tire heats up and wears and reduced gas mileage increased tire wear. to much pressure and contact area goes down and safety is compromised.</p></blockquote><p></p>
[QUOTE="Ponderous Curmudgeon, post: 76122137, member: 433179"] Agreed, far from original but I think the real problem is Chesterton seems to be assuming that the locked tire is due to the wetness of the road when in fact that is only part of the situation. My summary; Friction between tire and road is decreased by the presence of water on the road due to water between the tire and the road and the shear in water layers. This is the case whether the tire is rolling or not and the main cause of "slipperiness" as we generally think of it. Rolling friction (static friction)when the tire is rotating is greater than sliding (kinetic) friction when the tire is locked. Confusion here because static and kinetic seem to be the opposite from rolling and sliding, but the reference is to the contact patch and whether it is moving relative to the road surface contact patch. If the forces on the tire exceed the frictional static force on the tire either due to braking or excessive power to the wheel, you shift to the kinetic mode. If due to braking, you skid and leave a black mark, if due to engine power, you have a burnout and leave rubber on the road that way. But in both cases water on the road will decrease friction further. Finally tire design, agree, tires are elastic and designed to optimize contact patch to little pressure and patch increases in size and tire heats up and wears and reduced gas mileage increased tire wear. to much pressure and contact area goes down and safety is compromised. [/QUOTE]
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Not Slippery When Wet
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