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Re: force



Observables

Acceleration relative to a reference frame is observable in the sense that
it can be determined from the observed quantities position and time.

If you experience a force on your body you can feel it only if it results
in a deformation. Similarly, if you experience jerk, you can feel it
only if it deforms you body. How does one distinguish one feel from
another? It seems to me that deformations are observable but forces are
not.

Gene