For practical purposes, the NASCAR rule book assumes that every driver
weighs at least 140 pounds.
By rule, a Sprint Cup car must weigh
3,300 pounds. Where the weight of the
driver is concerned, for every 10-pound
increment below 180 pounds, 10 pounds
of weight must be added to the car. So if
a driver weighs between 170 and 179
pounds, the car must weigh 3,310 pounds
to compensate."
(source)
Use Newton's Second Law of Motion
(f=ma) to explain why NASCAR has th