| Aren't the dowforce and resistance basically the same thing, "drag"? I mean, if there was no downforce, it wouldn't cause resistance, downforce does just that (force the car down, like an upside down plane wing) so isn't that a good analogy?
For example, and object with the same frontal (or in fact overall) area wouldn't cause as much risistance/drag if it wasn't wing shaped? | 
