On Sat, 21 Nov 2015 04:58:58 -0800 (PST), Y <
yana...@hotmail.com>
wrote:
>On Saturday, November 21, 2015 at 8:25:11 PM UTC+10, kefischer wrote:
>> On Fri, 20 Nov 2015 23:41:07 -0800 (PST), Y <
yana...@hotmail.com>
>> wrote:
>>
>> >On Saturday, November 21, 2015 at 12:17:47 PM UTC+10, kefischer wrote:
>> >
>> >> There has been nothing to show that
>> >> inertia is a field of some kind, or that any
>> >> kind of field causes it.
>> >
>> >Absolute rubbish ! The entire reason that bodies accelerate inertially in freefall indicates that a field is responsible.
>>
>> You really should read about "coordinate acceleration".
>
>Coordinate acceleration isn't a physical thing.
I wish I could talk about nature with the
confidence you exhibit. Actually, coordinate
acceleration can be either "proper acceleration",
or it can lack proper acceleration, depending
on where and how and what acceleration is
measured.
The big difference in your assertion above,
and my discussion, is that, a gravimeter, pendulum,
and accelerometer, and human feelings do not
register freefall AS acceleration, but Newton
mechanics does consider freefall to be an
acceleration.
>Coordinate acceleration is just the acceleration of coordinate.
I don't think that is worded correctly, it seems
to assume that one end of the measurement is
"fixed", or "at rest", and the other end moves
with changing velocity.
>It's something that happens in a mathematical model.
>Nothing even moves. It's just numbers and symbols etc.
That is nonsense jibberish, if you want to
discuss physics, you need to be more specific.
>How many times does Roberts, or I, or others have to
>explain to you the difference between the physical world
>and the world of mathematical models before it sinks in ?
I see a world of difference between what
you and Roberts say. :-)
>> >How else does a body accelerate while remaining inertial ? The field itself is responsible.
>> >-y
>> It doesn't accelerate, :-)
>> the ground accelerates upward. :-)
>>
>> Really! :-)
>
>"How else does a body accelerate while remaining inertial ?"
>
>1. You answered correctly when you said "It doesn't accelerate".
>2. You answered incorrectly when you said "the ground accelerates upward."
>You have NO proof of that, or evidence, or way to measure that).
I am only accepting what the physical devices
that do the measuring of proper acceleration show.
I do not talk across the differences specified
by models. Newton says freefall is acceleration,
GR seems to say it isn't, the Divergent Matter
model says it definitely is NOT.
>We do have proof that a freefall body does not accelerate
What "proof" is that of which you speak?
>and this is what inspired Einstein to create GR.
I think he said it is "what humans feel"
when falling, compared to what they feel
when on the surface that caused him to
"extend relativity theory" to include gravity.
>So let's roll with your correct assumption. A freefall body does not accelerate.
>The only way that a body can accelerate is against the background of nature
I don't know what you mean by that,
if I try to aim a camera at a falling object,
I have to move the angle the camera points,
unless I am falling, or accelerating the
camera downward with a force equal
to it's mass neglecting air drag.
>(satisfying the condition of Newton's Law that F=ma > 0).
That is not a consistent statement with
what you have been saying.
>Now let's get this little problem of representing nature's background
>(whatever that is). Using mathematics we do this with things called SPACES.
You need to explain that, it is wording
I don't remember seeing. I did not forget,
I just don't remember ever seeing it stated
that way.
>Spacetime is one such example. We can also put things in those spaces..
>like field lines, or other geometries lol. It really is that simple.
Why the lol, "field lines" are not a type
of geometry, they are either real, like in
magnetism, or fictitious or imaginary,
as in Newtonian gravitation.
Doing coordinate transformations is above
the level of this discussion as long as only you
and I are concerned.
>Since a freefall body is not accelerating with respect to the natural background,
>and appears (inertially to remain at rest with the natural background),
>could it be the natural background itself that is doing the accelerating ?
>Possibly, but not necessarily. We know that the speed of light is constant.
>So Energy is unlikely to be doing any speeding up as it comes towards a planet.
I don't see rational consistency in all
of those statements.
>HOWEVER.
>
>We do know (using field lines) that the density of absorbing energies is greater
>towards a gravitational centre of mass, and that these absorbing energies are
>lesser the further we go out.
Are you now talking totally within the
Newtonian model of gravitation, or not,
you seem to be (to me).
>In a manner of speaking, and certainly if gravitational bodies both dissipate
>and absorb energies (which they do) it could be argued that gravitational
>bodies are monopoles.
>
>-y
Are what? Why did you stop, did you
fall asleep and hit the send button? (Twice?)