The earth will rotate backwards due to the conveyerolis effect, how much the earth rotates will depend on the the angle of the conveyer in relation to the earths rotation, direction and distance to the equator.

If the treadmill was placed on the north pole the plane would rotates around on the treadmill in a counter clockwise direction.

Kevin

87 Turbo Intercooled Raider, roller cam, torsen rear diff, LSD front diff, lockup auto with modified converter, V6 brakes, low transfer case gears...