firstly, i am not an enginneer or a physicist, so if i write something foolish, have that in mind. i have heard that the reason why some cars have spoilers is to counter the upward lift that the air gives to the underbody of the car as it accelerates forward. this stabilizes the car at high speeds. i have three questions about this. #1: is this correct, and if not, what is the correct explanation? #2: if the above explanation is correct, will a normal car that needs a spoiler take flight at high speeds if it doesnt have one? (since this is how a plane works, i think, by producing more upward lift on the underbody of the wing than lift on top of the wing) #3: if a spoiler is installed, assuming that it is installed correctly, does it in any way decrease the acceleration or speed of a car?