As I understand it, the lack of area effect on friction is for sliding
friction.
Race cars, including dragsters, don't want the tires to slide or slip.
The area of the surface is a significant factor in static friction.
petel@tenet.edu
Pete Lohstreter "The first rule of intelligent
North Garland High School tinkering is to save all the parts."
Physics Department Aldo Leopold
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Garland, TX 75042