Also great breakfast food when you're in a hurry. The force that holds a car onto the track. The more downforce, the more grip, but that also means there's more drag, which slows a car down. People get paid big bucks to find the ideal amount of downforce. The lead car displaces the air, creating a vacuum to suck the trailing car along.
Drivers can use it to save gas.
Drafting is especially important at Daytona and Talladega because of the high speeds. Put your hand out the window of a moving car with your palm facing forward. Then turn your palm down to the ground with your fingers extended forward. You'll know what drag is then. He'll be remembered as his sport's Michael Jordan or Arnold Palmer.