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One wheel turning faster than the other is normal if both wheels are off the ground. If one wheel is dragging when the other wheel is on the ground, it could be brakes or a wheel hub bearing. Usually if the noise happens on right turns, the left hub bearing is failing, and vice versa.
There are two speed sensors one is called a revolution sensor that is located on the case of the transmission. You can take the driver side wheel off and see the sensor on the top of the case of the transmission. A 10mm bolt is holding it in. Easy fix
a) a brake disc shield is too close to the disc, and it's coming into contact in the circumstances you outline
b) pebbles stuck between the disc shield and the disk
c) dried out wheel bearings
d) worn Universal Joints in the drive shafts
e) worn A/C pump
f) worn alternator
g) worn water pump
Is the noise still present above 15 miles an hour and past 1500 rpm when the clutch is disengaged (i.e. gearbox in neutral?). The answer to this question may help you to pinpoint the source. I know it's stating the obvious but the fact that you're hearing a grinding sound means it's caused by something that is moving relative to something else. Again this should help narrow down the cause.
See If the pitch changes when you swerve the car from left to right. You don'e have to swerve hard enough to scareanyone, just enough to load one side more than another. If the pitch changes, you likly have a bad wheel bearing or tire. Tires will make any noise a wheel bearing will so switch tires first side to side and see if the problem fgollows the tires. If not then check the wheel bearing.
Also and maybe first:
The fact that the noise is limited to such a narrow speed could also indicate an aerodynamic issue such as a roof rack or bike rack or somthing like that having moved and is now vibrating.
Check the condition of front disc brake pads, if they are in need of replacement a preset little metal arm starts rubbing the discs and will make a whining noise. It doesn't do any damage but it's irritating to listen to.
The squeal is usually the tell tales that make a noise when the front or rear disk pads are worn to where they need replacing. However, with drum brakes, that is an indication of totally worn out shoes, or a broken part. STOP driving the car, go to a mechanic (or friend) and have them checked.