AviationBanter - View Single Post - The Impossibility of Flying Heavy Aircraft Without Training

[email protected]

Alan Baker wrote:
In article om,
wrote:

Jose wrote:
Perhaps you are not familiar with nerf balls. Nerf balls are foam
rubber. When a cue ball hits a nerf ball (sufficiently large) nerf
ball it stops and the nerf ball just quivers a bit. The center of
mas quits moving. The kinetic energy of the cue ball has been
converted to heat. Energy is conserved, momentum is not.

There is more to that. If this collision occurs in outer space, I
guarantee you that the center of mass will =not= quit moving.

But it will not move in a manner that conserves momentum.

You really need to study basic physics...

Doh!

You'd never guess it but I did get A's in freshman Physics.

Of course I had that bass akwards. Energy can change from
kinetic to gravitatonal potential to heat etc. An elastic collision
is one in which kinetic energy is conserved. In an inelastic collison
some kinetic energy is converted to another form, typically heat.
Momentum is always conserved, as you noted earlier.

--

FF