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For example, hot rubber (such as Indy car tires) seem to care, but cool rubber doesn't.
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I think this is so because conduction of heat depends directly on area of contact, and the tires are so wide so they stay cooler (don't compeltely melt).
I really don't think you need to worry about area when dealing with friction... If the field is made of sand this season (for example) we'll need to worry about pressure so the wheels don't sink into the sand, but I think you only worry about pressue for stuff like that.
Hehe, the Q&A works by not allowing extra discussion until a Mod has answered. Then you get the extra link. That's so there's a qualified answer first
