Two disks, one weighted in center and other on rim, roll down ramp.

2 cylinders, same dimension, roll at different speeds. 2 cylinders with identical dimensions. (Diam.=11cm., width=4.5cm) are shown to have equal mass. They are released simultaneously on an inclined plane. The cylinder with the weighted center quickly takes the lead over the cylinder with the weighted rim rolling down the incline.
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for tue 5 sept lecture