Re: KE & P

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#1390

From: Robert Stair
Date: Thu, 14 Jul 1994 13:09

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Joe,
  Your statement that "most collisions are cases where energy is not
conserved, but momentum is" is true if we are considering only
"mechanical" energy (KE + PE).  In elastic collisions, this quantity will
be conserved; in inelastic collisions (the majority on a macroscopic
scale), it will not be conserved.  In either case, however, the "total
energy" (KE + PE + thermal and mass energies) WILL be conserved.

Bob Stair
AAPT Physics Teaching Resource Agent
bobstair@csn.org

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Subject: Re: KE & P
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