Le_Forgeron <jgr### [at] freefr> wrote:
> According to physic, the global work is null.

  At least according to newtonian physics. I'm wondering if general
relativity muddles this because it says (and there's rather compelling
empirical evidence that GR is right in this) that the object sitting on
the shelf is actually in a constant state of acceleration (while, perhaps
rather ironically, a free-falling object is not, which is kind of the
complete reverse of what newtonian mechanics says).

  It's curious, even though I have read quite some material about both
newtonian mechanics and both theories of relativity, it's still unclear
to me how the "traditional" postulates of newtonian mechanics (such as
the quintessential "F=ma" and other such basic formulas) work when we
take general relativity into account (especially when we are talking
about gravity rather than simply forces applied to objects floating
in zero gravity).

  In classical newtonian mechanics the total amount of work performed
on an object on the floor is zero, but is it also in general relativity?
How does GR affect this? Or does it affect at all?

-- 
                                                          - Warp

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