if you dont know what you're talking about please don't answer
lift is usually on the back...as air goes over it creates vacuum lifting back end...[spoiler provides down force]...on front air gets under causing it to want to fly...[counter acted by air dam]
Yes. Due to the shape of most cars, lift is created due to the airfoil affect. Air travels over the top of a car faster than underneath creating a low pressure area at the top, pushing the car up. This is the same phenomena that makes an airplane wing work. As speed increases, lift increases. Performance cars and racers become unstable when this happens so they have specially designed wings, air dams, etc. to create counteracting downward force and reduce the amount of air which flows underneath the vehicle.