The spinning ball spiral

Details The spinning ball spiral The spinning ball spiral

Sep 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12i3004d&link_type=abstract

New Journal of Physics, Volume 12, Issue 9, pp. 093004 (2010).

Physics

2

Scientific paper

We discuss the trajectory of a fast revolving solid ball moving in a fluid of comparable density. As the ball slows down owing to drag, its trajectory follows an exponential spiral as long as the rotation speed remains constant: at the characteristic distance L where the ball speed is significantly affected by the drag, the bending of the trajectory increases, surprisingly. Later, the rotation speed decreases, which makes the ball follow a second kind of spiral, also described in the paper. Finally, the use of these highly curved trajectories is shown to be relevant to sports.

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