Re: "Is There a Force of Gravity?"

On Wed, stephen@xxxxxxxxxx wrote:

>>>Joe Fischer wrote:
>>>> I dom't know what you want, vector values in
>>>> polar or rectangular coordinates?
>>>
>>>I wanted your explanation about how the expansion of the
>>>earth and moon explains the moon's orbit.
>
>> If you are a student, please don't pay attention to anything
>> I say. I think you have it backwards, why do you think the
>> moon should go straight?
>
>I am trying to figure out what your theory is.

I don't have a theory. A "theory" requires some
measure of formalism, and I am neither mathematically capable,
physicaly comfortable enough, or even inclined to do that.

> Apparently
>you are rejecting Newton's first law and saying that the
>moon will not travel in a straight line relative to the Earth
>even though no force is acting on it.

Apparently you have never heard of General Relativity,
sorry I forgot to check to see if this thread is being crossposted
to relativity.

Of course the moon would travel in a straight
line of there were no other matter in the vicinity, but
I don't see how that is a concern considering the
Earth is quite close, and the Sun is massive enough
tho be the dominating gravitational object.

The moon does not orbit the Earth, they orbit
each other, and both orbit the sun. The orbit of
the Moon is always concave toward the Sun.

I will snip some of your questions and remarks
for now, and skip to what I see as the problem, and
maybe come back to what I skip later.

>[snip]
>What statement? I am asking you to explain your theory.
>If you want to reject Newton's first law that is fine,
>but you need to explain why it seems to work so well when
>it is apparently not true according to your theory.
>Stephen

Is it true according to General Relativity?

Isn't Newton's first law just a recitation of the
basics of Euclidean space? I will have to see what
it is and if General Relativity uses it or assumes it.

I really don't see anything about Newtonian
gravitation that applies, even though it is the most
useful for engineers and for quick calculations.

Are you assuming that GR merely describes
gravitation as a curvature of spacetime with Euclidean
space as a background?

While there is math in GR to convert to Newtonian
or Euclidean coordinates for applied physics, GR uses
no vestige of space attributes.

Perhaps the saying "GR is local" is thought to
appliy to space alone, or to spacetime, but the fact is,
there is nothing to say that GR is not local in time.

Undergraduates and arts majors would be better
off avoiding anything other than Newtonian physics,
thinking about alternate theories of any kind can wreck
a career.

Joe Fischer

.

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