Re: Pb

["S.Goelzer" <sgoelzer@COEBROWNACADEMY.COM>]

Jim Green wrote:

> The answer to all of the so called "energy flow" questions is buried in the
> work/energy law/theorem.
>
> None of the "energy" is "lost" but it doesn't "go" anywhere either.  Work
> is done on various parts of this complicated system by the various parts of
> this system and the energy of these parts is increased or decreased, but
> the energy does not move.  Energy is a property of a system or its
> parts.  One would not likely say that blue moves.  Blue paint can move, the
> ball can move, but energy does not move by itself.

Go , transferring, worked, moved, changed, transported  - pick a verb.   But I need a
verb that shows that one object has increased in a property and the other decreased.
Heresy or not,  thermal energy  has a fluid-like properties even though it is not a
fluid.  There is a duality here that seems no different than the wave-particle duality
accepted for light. I seemed to have convinced some people I believe in Caloric which is
not the point of my  orig. post. (which was NOT elastic vs. inelastic collisions).

Again  :
After any real collision I do in my lab some of the energy is in the form of thermal
energy, This is quite imperceptible to my students (other than the fact that the objects
involved are going slower). How do I demonstrate that the energy still exists in a
different form (most intro. students are satisfied with a qualitative demo) ?  Is the
burned paper/steel ball demo or the thermal card changing color demo proving this?
--

*****************************
S.Goelzer
Physics Teacher
Coe - Brown Northwood Academy
Northwood NH 03261
603-942-5531 ext43
sgoelzer@coebrownacademy.com
*****************************