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Re: momentum conservation(2)



John,
Let me add that mathematically (staying in one dimension) it is the simple
observation that two (signed) numbers may each vary so that their SUM is
conserved, even though the SUM OF THEIR SQUARES is not conserved.

This applies,eg., to the velocities of two equal masses in collision.

Keep thinking!

Bob

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor

----- Original Message -----
From: "Bob Sciamanda" <trebor@VELOCITY.NET>
To: <PHYS-L@lists.nau.edu>
Sent: Tuesday, March 14, 2000 11:26 AM
Subject: Re: momentum conservation(2)


. . . The mathematics and the physics allow the change in the system
"mv"
[vector] to be zero, even though the change in the system mv^2 [scalar]
may be non-zero.

Bob