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Thelmacoyle
06-09-1999, 07:52 PM
Dear Biomech-ers

We are currently setting up an experiment to look into catching. We will
need to be able to reconstruct theoretically the trajectory of a tennis
ball in flight given initial conditions. To do this we need to know the
forces acting on the ball as it moves through the air. If we apply Stokes'
Law directly( without taking into account the nature of the ball's surface)
, our calculations and preliminary measurements do not correspond. I am
convinced we need to take into account the friction on the surface of the
ball. Is anyone aware of any measurements or research done on this subject
which could help us out? Basically I need the coefficient of friction of
the felting on a tennis ball.

Thanking you ... Thelma.



Thelma COYLE UMR 6559 "Mouvement et Perception"
Faculté des Sciences du Sport(UFR STAPS)
Université de la Mediterranée(Aix-Marseille II)
163 Avenue de Luminy, CP 910
13288 Marseille cedex 9
France

tel. (33)[0] 4 91 17 22 00
Fax (33)[0] 4 91 17 22 52

e-mail : coyle@laps.univ-mrs.fr
web : http://www.laps.univ-mrs.fr

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