Rigid‐body dynamics of a football
作者:
Peter J. Brancazio,
期刊:
American Journal of Physics
(AIP Available online 1987)
卷期:
Volume 55,
issue 5
页码: 415-420
ISSN:0002-9505
年代: 1987
DOI:10.1119/1.15123
出版商: American Association of Physics Teachers
关键词: RIGID BODIES;AERODYNAMICS;PRECESSION;SPIN;EQUATIONS OF MOTION
数据来源: AIP
摘要:
The motion of a spinning football provides interesting illustrations of some of the principles of rigid‐body motion. The familiar ‘‘wobbly spiral’’ is an example of torque‐free precession; it is shown that the ‘‘wobble‐to‐spin’’ ratio depends only on the principal moments of inertia of the football. The angular momentum of a spinning football is not always conserved in flight. The response of a football to aerodynamic forces can best be understood by comparing its motion to that of a spinning top or gyroscope.
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