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From: cher@ihlpm.UUCP (Mike Cherepov)
Newsgroups: net.physics,net.sport
Subject: Spin on a ball.
Message-ID: <758@ihlpm.UUCP>
Date: Fri, 28-Mar-86 16:41:33 EST
Article-I.D.: ihlpm.758
Posted: Fri Mar 28 16:41:33 1986
Date-Received: Tue, 1-Apr-86 07:33:52 EST
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Organization: AT&T Bell Laboratories
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Xref: watmath net.physics:4025 net.sport:732

--
If a (tennis) ball flies through the air while rotating around
the vertical axis (view from above):

			  O ---->speed
			<-spin	

it would start curving to the right (relative to the direction
of movement).
At least that's what I've observed 1000 times.
I was trying to explain it to myself (higher-pressure area in front =>
more friction against the air in front) , but that scheme
suggests quite the opposite - it should be curving to the left!!!

This is very disturbing. Does anybody have a better theory (come to
think about it, anything would be a better theory)?
		Mike Cherepov
-- 
Mike Cherepov