What factors can affect friction?
First one is the shape of the race car, a flat boxy surface is perpendicular to the air thus the air's exerted force is perpendicular thus it directly slows the car down. The other factor is speed, the friction due to air is directly proportional to the speed of the object moving through air, thus the faster the car goes the higher the friction (seems logical doesn't it? Move your hand through the air, which way do you feel more wind? Moving your hand slowly or quickly?).
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