Circular motion
Net force = ma where a is the centripetal acceleration. The erasers resting on a turning surface . As the angular speed is increased the one at the outer edge fly off first. Since friction= ma , has a fixed value. If r is greater , the angular speed at which it fly off will be smaller (given that a = w*2 r). Hence when the angular speed is increased , the eraser with the greater r reaches the limiting angular speed first.
