Why is my car grinding while I drive?

check for sticking calibers on disc brakes, worn wheel bearings will sound like a rolling train without showing much looseness also!

I am having a same problem with my Matrix 04, on the passenger side sounds like metal to metal grind noise. I don't even have to turn to hear it, it's always there.

I haven't had the time to get mine fixed just yet, but I am starting to wonder if my rotors are bent. My wheels get stuck, and I usually have to pound them loose with a small sledge hammer. I wonder if this bent the rotor just enough.