Re: Force sensors (2)

[jmclean@chem.ucsd.edu (James Mclean)]

Rauber, Joel              Phys says:
> Measuring the elongation over time to be constant, does tell me the 
> acceleration over that is zero, and hence can be viewed as a measurement of 
> the acceleration.  The elongation is a determination of position and if that 
> is constant in a coordinate system, the acceleration is zero for that 
> position in the the said coordinate system.

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