Re: Falling Objects, How They Fall

On Fri, "Rudi Menter" wrote:

>Joe Fischer write:
>>>Right. In addition, GR "works" with radiation (by e=mcc), too.
>>
>> No, GR does not "work" with radiation.
>
>
>Work is written in quotes. Radiation is part of
>the energy-momentum tensor.

I think in GR, gravitational radiation is only a
side effect, and experiment has not supported the
premise that it even exists.

>> GR does not say "how" gravity works.
>
>Of course, I neither said nor meant that.

I considered GR to mean gravity. :-)

>> If any "force" acting at a distance was how
>> gravity works, then that same force would have
>> to act to produce the "force" of inertia, and that
>> is nonsense if it involves acting at a distance.
>
>Yessses.
>
>> The description by Baez is for a different
>> situation, and is meant for the novice.
>
>?

That web site is given as a link to interested
people who may have rudimentary questions about
General Relativity, and what you quoted was not
meant to be a technical description of the energy-
momentum tensor.

>> While inertia is closely related to gravity,
>> absolutely nothing is known about how gravity
>> works, and almost nothing is known about how
>> inertia works.
>
>Of course not. Physics is not for explaining why the world
>is there and w h y it works the way it does.

Not why, but "how things work" is of great interest.

> We may find,
>anyhow, descriptions that relate more complex issues to
>less complex ones, thus explain something, in a kind, by
>related or even causing facts.
>
>> For the same reason that gravity does not
>> work by "forces" acting at a distance, inertia does
>> not work by forces acting at a distance.
>
>OK, same r e a s o n (!) it does not.
>You better avoid "reason" ;)

In the above "reason" did not refer to gravity
but to the concept of action at a distance.

>> Inertia must work by internal forces which
>> are certainly quantum effects based on a changes
>> in the kinetic energy within matter.
>
>Nope, there's no "must" according to your above statements.

It is the reason Mach's inertia is not favored.

>> And any model that has gravity work by the
>> close range internal dynamics of matter has a
>> big advantage.
>
>There is no "work" of gravity (as you said).

The mechanism or mode of operation.

>And what the heck do you mean "by the
>close range internal dynamics of matter", if any?
>
>Quite confusing...

I suppose, but it is related to the alternate
model of gravitation I study, which describes
the mechanism that causes the geometry of
gravity by atoms and molecules expanding.

If atoms and molecules stay the same
size, then inertia is more of a mystery than if
they are expanding.
With expansion, any acceleration by
external contact forces could cause a change
in kinetic energy within the atoms, causing
the resistance to acceleration called "inertia",
or inertial mass.

Lorentz and Einstein talked about the
internal motion/orbits of atoms, but did not
seem to follow up on it as far as I know.
They seemed to assume a change in
length, but I think the motion would go back
to normal after the external contact force
is removed.

When something is as mysterious as
gravity and inertia, the more speculations,
the better.

Joe Fischer

.

Relevant Pages

  • Re: Relativists Conclusively Prove They Are a Bunch of Morons
    ... belief in the very real fact of inertia is concerned... ... want Einstein quotes re inertia? ... I am dropping out of this now;-) I'm onto the speed of gravity now. ... gravitational *and* a form of energy, and some interesting thoughts pop up. ...
    (sci.physics.relativity)
  • Re: Relativists Conclusively Prove They Are a Bunch of Morons
    ... I love Einstein, and have read a lot of his books. ... belief in the very real fact of inertia is concerned... ... I am dropping out of this now;-) I'm onto the speed of gravity now. ... mass to be a form energy. ...
    (sci.physics.relativity)
  • Re: Relativists Conclusively Prove They Are a Bunch of Morons
    ... I love Einstein, and have read a lot of his books. ... belief in the very real fact of inertia is concerned... ... I am dropping out of this now;-) I'm onto the speed of gravity now. ... mass to be a form energy. ...
    (sci.physics.relativity)
  • Re: The Gravity Energy Muddle
    ... That is the whole point of the 1918 papers on the GR "energy ... > What is the objective Difftensor Matter? ... So you now seem to have left the Einstein camp on the vacuum ... > tuv(Matter-Gravity) is NOT the energy of gravity in any sense! ...
    (sci.physics.relativity)
  • The Source of Gravitational Energy
    ... When one applies the correct relativistic transformations to the ... the source of gravitational energy becomes apparent. ... gravity are: ... If we accept that the Principle of Relativity applies, ...
    (sci.physics)