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...
One of my bathroom scales registers the compression of a spring, which
responds to a force, not an acceleration. Another of my scales
registers the elongation of a strain gauge, which responds to a force,
not an acceleration.
Even a hanging pendulum (or tethered helium balloon) repond to
accelerations through intermediary
forces (I hasten to add: "as viewed and understood from a Newtonian
inertial frame".) Whew! Hope
that avoided some flames :)
-Bob Sciamanda