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Re: free-body diagrams

----- Original Message -----
From: JACK L. URETSKY (C)1998; HEP DIVISION, ARGONNE NATIONAL LAB ARGONNE,
IL 60439 <JLU@HEP.ANL.GOV>
To: <PHYS-L@lists.nau.edu>
Sent: Monday, October 11, 1999 10:39 PM
Subject: Re: free-body diagrams


This is where most texts stop. I've now taken to at least mentioning
that
there is another force, the force of gravity of m_2 pulling up on m_1.
*********************
Say what?
As I understand it, m_2 is on top of m_1 and you are doing a
free-body diagram of m_1. That diagram shows only forces acting on m_1.
You are addressing a force acting on m_2, which does not belong in this
free-body diagram, if it exists.
Shame on the people who have already given thoughtless answers.
Regards,
Jack

Say what what?
The gravitational force of m2 acting on m1 is exactly what the man is
talking about! Check it again, Jack!
Shame on whom? ( not even an :) )

Bob

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