Dobri Karagorgov wrote:
Say I have a weight resting on a libra while the libra is displaying
1kg. Now I'll pull the weight up against the gravity until the libra
shows 0.5kg. Then I'l drop the weight in harmonic oscillations around
that 1kg point (the equilibrium point) neglecting the resistance.
What
kind of mass is the variable one that the libra is displaying in
range
of 1kg(+/-)0.5kg? Is it the weight's variable mass?
By the way, let me remind you that in libra just like in any lever we
get equilibrium only if the force/mass ratio remains the same all
along. Be carefull as well with addition of energy and mass - frogs
and grand mothers don't add.
If you have a libra (dual-pan balance) and it's balanced, and you pull
it up against gravity, I don't believe it will get out of balance. It
will still read 1kg. I don't believe this even requires equal arms.
Correct me if I'm wrong.
PD
.
