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Article #382Re: Inverting Tops -- How do they work?
From: Donald E. Simanek
Date: Tue, 18 Apr 1995 00:00
Date: Tue, 18 Apr 1995 00:00
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Refering to spinning footballs and class rings, I carelessly said:
> >They do not turn completely over! Therefore they never get a chance to
> >reverse their spin direction relative to their own axis.
On Tue, 18 Apr 1995, Matt Tuley wrote:
> ...and having done so: My class ring _does_ turn completely over. Hm. I must
> say it'll be nice to always have a particularly nifty physics
> demp always at hand...
And, of course, Matt is correct. (Can't deny the evidence!) It is
footballs which can be spun so they end up on a pointy end, raising their
center of mass, but shifting their rotation axis only 90 degrees with
respect to their own body.
The demo is always at hand. But the explanation...
-- Donald
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 16cfd8,8d3c200d2275f35b X-Google-Attributes: gid16cfd8,public From: "Donald E. Simanek" <dsimanek@EAGLE.LHUP.EDU> Subject: Re: Inverting Tops -- How do they work? Date: 1995/04/18 Message-ID: <Pine.A32.3.91.950418112546.54849A-100000@eagle.lhup.edu> X-Deja-AN: 101142536 sender: Sharing resources for high school physics <PHYSHARE@PSUVM.PSU.EDU> comments: Gated by NETNEWS@AUVM.AMERICAN.EDU content-type: TEXT/PLAIN; charset=US-ASCII mime-version: 1.0 newsgroups: bit.listserv.physhare