Double Cone Rolls 'Uphill'

It seems to roll uphill. Ask students to predict what will happen. Release the cone at the narrow end of rails that appear to rise. Key idea: Its contact points rise while its center of mass actually moves downward. Ask: Is the middle of the cone going up or down? Safety and cleanup: Keep setup low to the table. https://web.physics.ucsb.edu/~lecturedemonstrations/Composer/Pages/24.42.html