A system consists of a small bead of mass m that can slide along a large uniform ring of mass 5m. Initially, the ring is at rest on a horizontal table, and the velocity of the bead is v. Find the minimum kinetic energy of the bead during the subsequent motion of the system. Friction is negligible.

Quite a few readers successfully tackled our October Challenge, Tackle this!, including several first-time contributors. We are pleased to recognize the following successful solvers:

Guidelines for contributors

Many thanks to all contributors and we hope to hear from many more of you this year!

Note: we always welcome and appreciate reader-contributed original Challenges!

The solutions to the past Challenges can be found here: https://aapt.scitation.org/topic/collections/physics-challenge

Please note that AAPT membership may be required to view the files.

Boris Korsunsky, Column Editor

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.