Spinning ring on a table found to behave more like a boomerang than a coin

Spinning ring on a table found to behave more like a boomerang than a coin

Credit: M. A. Jalali et al., Phys. Rev. E (2015)

( Phys.org ) —A three of researchers, two with the University of California, the third base with Sharif University of Technology, in Iran, has found that a common closed chain, such as is worn on the finger, spins differently on a tabletop than does a coin. In their newspaper published in Physical Review E, Mir Abbas Jalali, Milad Sarebangholi and Reza Alam describe their tests and observations and offer a hypothesis on why a whirl ring behaves the way it does.

If you use your fingers to spin a coin on a tabletop, it will tend to move approximately on the postpone in the lapp direction that it is spinning until it stops. That is not the case with a spinning ring, the researchers found ( first by merely noticing it and then via testing ). Unlike the campaign of the mint, the ring will move first base in the direction of its spin, but then will stop motivate and reverse itself, moving against its own spin .
A mint, the researchers note, tends to spin in the like management as its whirl ascribable to friction—and that appears to be the subject with a gang deoxyadenosine monophosphate well. Both besides, at least initially spin atop a thin layer of air that gets trapped beneath one of its edge and the tabletop. But, because the closed chain, which is basically the same thing as a mint except for the large hole in it, has that hole, the trap air can escape. When it does, the researchers theorize, the frictional forces change, resulting in the ring stop and changing directions.

Intrigued by the odd apparent motion of the spinning ring, and surprised that they could not find any description or survey of it in the literature, the researchers set about studying the phenomenon in their lab. They created coins by cutting metallic element rods and rings by cutting alloy tubes, both of a variety of different sizes and thicknesses and then set them to spinning while recording with a high-speed camera .

Supplementary video from the paper “Terminal retrograde turn of rolling rings” authored by Mir Abbas Jalali, Milad S. Sarebangholi, and Mohammad-Reza Alam, published in Phys. Rev. E 92, 032913 – Published 22 September 2015
In studying the video, it became apparent to the researchers that the change in guidance came about due to the change in vent hang. They besides discovered that the reverse-effect occurred with all of the rings they tested, suggesting the demeanor is both coherent and replicable, traits they suggest, that might be useful when designing objects that move on topologically flat surfaces, particularly those that require complicate reorientations or automatic reversals.

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More information:
Terminal retrograde turn of rolling rings, Phys. Rev. E 92, 032913 – Published 22 September 2015, Arxiv: arxiv.org/abs/1412.1852
Terminal retrograde turn of rolling rings, Phys. Rev. E 92, 032913 – Published 22 September 2015, dx.doi.org/10.1103/PhysRevE.92.032913. On ABSTRACT
We report an unexpected turn back gyrate turn in the final stage of the motion of wheeling rings. It is well known that spinning disks rotate in the same management of their initial tailspin until they stop. While a spinning surround starts its gesture with a kinematics alike to disks, i.e., moving along a cycloid path prograde with the guidance of its fixed body rotation, the mean trajectory of its center of aggregate late develops an inflection point so that the ring makes a spiral turn and revolves in a retrograde direction around a new center. Using eminent speed visualize and numerical simulations of models featuring a seethe rigid body, we show that the excavate geometry of a ring tunes the rotational air out drag resistance so that the frictional push at the contact point with the ground changes its direction at the inflection period and puts the ring on a retrograde gyrate trajectory. Our findings have electric potential applications in designing topologically new surface-effect flying objects adequate to of performing complex change of direction and translational maneuvers.

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Journal information:
Physical Review Letters

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