Terminal retrograde turn of rolling rings.

@article{Jalali2014TerminalRT,
  title={Terminal retrograde turn of rolling rings.},
  author={Mir Abbas Jalali and Milad S. Sarebangholi and Mohammad-Reza Alam},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  year={2014},
  volume={92 3},
  pages={
          032913
        }
}
We report an unexpected reverse spiral turn in the final stage of the motion of rolling rings. It is well known that spinning disks rotate in the same direction of their initial spin until they stop. While a spinning ring starts its motion with a kinematics similar to disks, i.e., moving along a cycloidal path prograde with the direction of its rigid body rotation, the mean trajectory of its center of mass later develops an inflection point so that the ring makes a spiral turn and revolves in a… 

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