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Re: [Phys-L] two very different "gravity" concepts

The intended implication is not that the frame is "freely falling" but that,
in the observer's frame, the observed mass m is free to "fall".

-----Original Message-----
From: John Denker
Sent: Wednesday, January 02, 2013 7:18 PM
Subject: Re: [Phys-L] two very different "gravity" concepts

On 01/02/2013 04:57 PM, Bob Sciamanda wrote:
How about "free fall gravity" for 1, and "Newtonian gravitation" for 2 ?

The first part doesn't do it for me.

In particular, the crucial feature of the conventional terrestrial
lab frame is that it is *not* a freely-falling frame. Indeed, any
nontrivial application of F=mg requires a non-freely-falling frame.

Forum for Physics Educators

Bob Sciamanda
Physics, Edinboro Univ of PA (Em)