Forma, Vol. 23 (No. 1), pp. 31-32, 2008

A Spherical Horse Broadens Our Horizons of Study

Takeshi Sugimoto1*, San'ei Ichikawa2, Shigekatsu Saitou2, Keiichi Kawase2 and Masashi Mimura2

1Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa-ward, Yokohama 221-8686, Japan
2Japan Wildlife Research Center, 3-10-10 Shitaya, Taito-ward, Tokyo 110-8676, Japan
*E-mail address:

(Received August 7, 2008; Accepted September 4, 2008)

Keywords: Spheres, Toy Models, Conceptual Experiment, Problem Solving

Abstract. The spheres are the ultimate 3D toy models. Although the spheres are often treated as purely theoretical entities without real-world practicality, the spheres serve as hatchets to hard problems to be solved. Here are a couple of new twists to the classical mechanics: a sphere falling in the transverse winds and colliding with a branch. These results show usefulness of conceptual experiments by use of the spheres.

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