(a) Suppose a tire rolls without slipping on a horizontal road. Explain the role friction plays in this motion. What two surfaces are involved in this frictional force? Is it static friction or kinetic friction?

(b) Suppose a race car driver wants to get his car started very quickly and “burns rubber” as he leaves the starting line. Is he exploiting static friction or kinetic friction?
(c) Normally, the coefficient of kinetic friction between two surfaces is smaller than the coefficient of static friction for the same two surfaces. Assuming that is true for the case of friction between a car tire and a road, explain why the car will accelerate faster if the driver does not “burn rubber.”