Normally a wheel or halfshaft bearing will whine at speed and will grind at all speeds, when severely worn.
Wheel bearing?
The wheel bearing
My guess is your brakes might need some work. It all depends on what kind of noise you're talking about, though.
Bad Tire or wheel bearing, rotate the tires to the front if the noise follows its the tire if remains in rear its the wheel bearing
that could be a variety of things, wheel bearings, u joints, rear end...
Brake linings worn out or wheel bearing is bad
If it is a rear wheel drive vehicle it is either low oil in the rear end or an axle bearing. On a front wheel drive vehicle it is probably a bearing.
have you checked your car for aliens?
what causes rear wheel rotors to heat up
Could be a bad wheel bearing front or rear.
The wheel bearing?
On a front wheel drive car I would suspect bad CV joints. On a rear wheel drive car I would suspect a bad universal joint. Have a mechanic look at it right away.