When you think of the phrase "fluid dynamics" — which is to say, the branch of physics that deals with objects' motion through fluids — you may be inclined to conclude that it has nothing to do with cars, whether on the race track or on the street. However, as Live Science explains, in a practical sense, objects move through liquids and gasses in many of the same ways, and so this scientific field is concerned not only with objects' movement through liquids but through the air as well.
Of course, this field of study is important in aviation and space exploration, but it's also quite important when it comes to vehicles on the ground, such as trains, buses, and cars. And the racing industry figured out relatively early on how much of a role fluid dynamics plays in how a car performs on a race track, including (but not limited to) keeping it from crashing spectacularly.
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