Double Cone and Plane

A double cone is placed on the bars of an inclined plane. Instead of rolling down the plane the cone rolls up. Although the plane slants upward, the bars diverge so that the rotational axis of the cone, which passes through the center of mass, actually moves downward.

 

Hewitt-Drew-it! 35. RR Wheels

Paul links the linear-rotational speed relation to an explanation of why railroad trains stay on tracks via tapered wheel rims.

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