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Well, we may have to agree to disagree here, but I'll try another post to
make sure my point is understood, even if not agreed with:
I'm dicing up the observation into very tiny parts:
observe that elongation is constant
/ \
/ \
/ \
/ \
Therefore, we can conclude Therefore, we can conclude that
that equilibrium has been internal accelerations are zero.
reached.
Yes, reaching either conclusion is a complete no-brainer. But I claim that
you are not logically required to go down the right leg in order to reach
the left leg. Therefore, measuring a force with a spring scale does not
require an acceleration measurement.
--
--James McLean
jmclean@chem.ucsd.edu
post doc
UC San Diego, Chemistry