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Dr. Chris Kirtley
12-12-2000, 02:17 AM
Dear all,

Can't resist having my two penneth/cents...

There are three of these mysterious "fictitious" forces in physics, the
other two being the Coriolis (as Gerry menioned) and the apparent force
that is a consequence of motion in an accelerating reference frame.
Those experiencing the forces cannot tell that they are fictitious in
any sense. Indeed, the cornerstone of Einstein's theory of general
relativity is the equivalence principle, which states that "fictitious
forces cannot be distinguished in any way whatsoever from real forces,
by any
interior' experiment."

Incidentally, I've always wondered why there are no centrifugal forces
included David Winter's 2D inverse dynamics analysis (in Biomechanics
and motor control of human movement and elsewhere). Did David leave
these out because they are negligible in gait, or for soem other reason?

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 105B
Catholic University of America
620 Michigan Ave NE
Washington, DC 20064
Tel. 202-319-6247, fax 202-319-4287
Email: kirtley@cua.edu
http://engineering.cua.edu/biomedical

Clinical Gait Analysis: http://guardian.curtin.edu.au/cga
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