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I don't have a problem with the naive way as a rough initial indicator for
the primitive concept of force: for the human tactile sensor, the
atmospheric pressure equilibrium situation is taken as the normal (zero
net force), and felt departures from this of greater or lesser
"amount" (from light to forceful all the way to painful) are taken as
rough measures of greater or lesser forces being applied. Granted the
subjective nature of such sensitivity, much refinement is needed (as in
all cases of going beyond the estimation of the human senses to real
scientifically precise measurement), but its a start. Piezoelectric
sensors would be a possible next step, with zero potential difference as
the zero reading.
A. R. Marlow E-MAIL: marlow@loyno.edu
Department of Physics, Box 124 PHONE: (504) 865 3647 (Office)
Loyola University 865 2245 (Home)
New Orleans, LA 70118 FAX: (504) 865 2453