Yes BlackDeath's link is pretty much what I want. Add saying just "physics" was kind of dumb. I really meant things like gravity. Like in Halo when you fly off a cliff in a Warthog ( a buggy for anyone who hasn't played Halo) and the awesome physics kick in and if falls perfectly and stuff. Some stuff like collidsin detectin, and light simulations too.
If anyone has any other links that would be great but BlackDeaths is great and thats pretty much the stuff I want.