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-----Original Message-----_______________________________________________
From: Forum for Physics Educators
[mailto:PHYS-L@list1.ucc.nau.edu] On Behalf Of David Abineri
Sent: Monday, December 05, 2005 7:55 PM
To: PHYS-L@LISTS.NAU.EDU
Subject: Momentum
In the ideal case of two equal masses colliding linearly
where one is stationary and one is moving whereby they stick
together after the collision (totally inelastic), the
conservation of momentum leads to the conclusion that half
the kinetic energy is lost to other forms. Of course, in the
real world, one has sound, deflection of materials, friction
at least that will convert the energy to other forms.
But what does this really say? What do the "ideal" conditions mean?
Why, regardless of the masses is exactly half of the kinetic
energy lost. When we say "ideal" conditions to we mean
frictionless, rigid objects in an airless world?
Can someone help make some sense out of this? I wish I could
make the question more clear so perhaps it is my lack of
clarity about the situation that is the cause of the
question. Any help in clarifying
this issue would be appreciated. David Abineri
--
dabineri@fuse.net