Rolling a double cone upward is interesting but oscillating it on a track having an elevated centre is fascinating. You can design three different arrangements of a pair of cones each requiring different tracks to roll up and oscillate on a track of elevated centre.

This content is only available via PDF.
AAPT members receive access to The Physics Teacher and the American Journal of Physics as a member benefit. To learn more about this member benefit and becoming an AAPT member, visit the Joining AAPT page.