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Re: .Bernoulli and curve balls.



Michael Moloney wrote:

My direct experience in balls curving is with ping-pong balls, where I recall
that
lots of topspin seems to make the ball curve down onto the table.
I never have experienced that when throwing the ping pong ball over handed.
That's what I call top spin.

Roger

I would say the top of the ball is travelling through still air faster that the
center of
mass, and the bottom of the ball is travelling slower, so that the faster
velocity on
top would a la bernoulli create lower pressure. This suggests that bernoulli
would
predict that the ball would rise instead of fall.

Maybe in a ping-pong ball it's the drag forces which dominate.

--

Mike

===============================================================
Mike Moloney
moloney@nextwork.rose-hulman.edu
Dept of Physics & Applied Optics (812) 877 8302
Rose-Hulman Institute of Technology Terre Haute, IN 47803
http://www.rose-hulman.edu/~moloney/index.html