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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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