Consider a tennis ball with mass m and diameter d, moving in air near the earth surface. The ball is spinning with angular velocity \(\vec{\omega}\) (the vector \(\vec{\omega}\) has the direction of the axis of rotation and magnitude ω = (t)/dt = \(\dot{\varphi}\)(t), where φ(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, 56, 1988, pp. 138–142.CrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 1997

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  • F. Klvaňa

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