PURPOSE: To demonstrate a center of mass paradox.

DESCRIPTION: When the double cone is placed on the narrow end of the V-shaped rails (at left) and released it rolls to the wide end (at right). The double cone appears to be rolling uphill, but in reality the center of mass is moving down.

SUGGESTIONS:

REFERENCES: (PIRA 1J11.50) Demonstration B1-07 is a smaller version of this demonstration.

EQUIPMENT: Large double cone on rails, as photographed.

SETUP TIME: None.