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Re: Energy, etc



At 06:12 PM 8/5/99 +0500, someone wrote:
Brian,

Have you cosidered force acting on the hand due to the
wall as a function of time and can we be sure that there is no
displacement of the hand during this interval.Interaction always
involves finite intervals and in such a finite interval there is
always displacement.

One does not have to go that far: There _is_ an effective force on the CM.
The wall pushes on the finger bones; the finger bones push on the wrist
bones; the wrist bones push on the ulna, the ulna pushes on the humerus,
the ... If I could remember the words of the song, I could go on -- of
course I would have to know enough anatomy to know which bone is the CM bone.

Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen