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[Phys-L] Re: conservation of angular momentum question

This is a great introduction to couples! I'd like to add that in an =
action-reaction pair, the two equal and opposite forces act on _diffe=
rent _ objects. This is a very subtle, but important, point that is =
often missed in explanations of applications of Newton's Third Law. =
In a couple, the two forces act on the _same_ object. Therefore the =
two forces acting as a couple do not comprise an action-reaction pair=
. =20
Vickie Frohne=20


=46rom: Forum for Physics Educators on behalf of Daniel Crowe
Sent: Mon 3/14/2005 10:57 PM
Subject: Re: conservation of angular momentum question

Most interesting couples are not associated with interaction pairs
(traditionally, action-reaction pairs), because most interaction pair=
share the same line of action.
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