Consider a tennis ball with mass m and diameter d, moving in air near the earth surface. The ball is spinning with angular velocity \(\mathop \omega \limits^ \to \)(the vector \(\mathop \omega \limits^ \to \) has the direction of the axis of rotation and magnitude \(\omega = d\varphi (t)/dt = \mathop \varphi \limits^. (t) \), where \(\varphi (t)\) is an angle of rotation). We will impose a Cartesian coordinates system (xyz) on the surface of the earth with the z axis directed vertically.


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  1. [1]
    E. G. Richardson, Dynamics of Real Fluids, Edward Arnold, 1961.Google Scholar
  2. [2]
    A. Štěpánek, The Aerodynamics of Tennis Balls - The Topspin Lob, American Journal of Physics, Vol. 56, p. 138–142, 1988.CrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 1993

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  • F. Klvaňa

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