It all has to do with the cross weight transfer that Al explained. How fast, or slow, weight transfers from one corner of the car to the other. You want to keep all 4 tires on the ground.
I have been using Dwarf Car Technology, by Steve Smith, as a reference while I build my car. There are several good books out there on handling and suspension. How To Make Your Car Handle, Race Car Suspension And Geometry are a couple others I have in my library.
It's all pretty mind boggling at times. I guess I should have paid more attention in physics class.
Just my .02 for what it's worth.
Good Luck
Steve