Groups > sci.physics.relativity > #460325

Re: Why does gravity have to be transmitted through particles when gravity isn't a force in general relativity?

From	Odd Bodkin <bodkinodd@gmail.com>
Newsgroups	sci.physics.relativity
Subject	Re: Why does gravity have to be transmitted through particles when gravity isn't a force in general relativity?
Date	2018-06-04 22:16 +0000
Organization	Aioe.org NNTP Server
Message-ID	<pf4doc$16h3$1@gioia.aioe.org> (permalink)
References	(15 earlier) <abbdc3db-48dd-416e-905a-73cf39a74adc@googlegroups.com> <pf0s7h$12kl$4@gioia.aioe.org> <51fde61b-4e7a-4d63-8392-8c3b6e6f251e@googlegroups.com> <pf1hr6$bl6$1@dont-email.me> <8ab9ce5d-3a39-41b5-aa1e-ae5c3fd544cb@googlegroups.com>

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kenseto <setoken@att.net> wrote:
> On Sunday, June 3, 2018 at 4:08:07 PM UTC-4, Volney wrote:
>> On 6/3/2018 3:04 PM, kenseto wrote:
>>> On Sunday, June 3, 2018 at 9:59:16 AM UTC-4, Odd Bodkin wrote:
>>>> kenseto <setoken@att.net> wrote:
>>>>> Question: What causes the centripetal force between the earth and the moon?
>>>> 
>>>> Gravity.
>>> 
>>> What causes gravity between the earth and the moon?
>>> Let me get this right:
>>> You asserted:
>> 
>> He stated facts, not assertions.
>> 
>>> 1. Orbital motion is due to centripetal acceleration.
>> 
>> Correct.
>> 
>>> 2. Centripetal acceleration is caused by centripetal force.
>> 
>> Correct.
>> 
>>> 3. Centripetal force is gravity.
>> 
>> In the case of the earth and moon, correct. If whirling a stone around 
>> your head, it's the force in the rope/string.
>> 
>>> 4. There is no centrifugal force.
>> It is a fictitious force, yes.
> 
> Why it is a fictitious force? When you stand in a Merry-Go-Around the
> centrifugal force try to throw you off it. 
> 
>> 
>>> 5. So what causes gravity between the earth and the moon?
>> 
>> Why did you go from centripetal force to the cause of gravity?
> 
> Because you said centripetal force is gravity. Let me ask you: what is
> the cause of centripetal force between the earth and the moon?
> 
>> If you 
>> believe in Einstein’s GR, gravity is the curvature of space-time.
>  
> I don’t believe in Einstein. His curvature of space-time is a
> mathematical description of the path of the moon orbiting the earth. I
> want to know what is the cause of gravity....what causes the earth attracting the moon?
> 
>> If you 
>> don't, there isn't an answer to the cause, but it is well known how it 
>> behaves. It behaves as F=GMm/r^2, regardless of its cause and that's all 
>> that matters when calculating the moon’s orbit.
> 
> So why do you ignore that I have the cause of gravity? Why don’t you
> comment on it? It is available  in the following link:
> http://www.modelmechanics.org/2015gravity.pdf 

There’s a very simple reason. Physicists will ignore any claims that you
have the cause of gravity until you can prove it is the cause of gravity.
And the only way you can prove it is the cause of gravity is if you can do
calculations with your cause, and those calculations match observation.
That is the required proof of your claim. Until you can provide that proof,
your claim isn’t worth attention. 


> 
>> 
>>>>> If there is no centrifugal force why did Newton used it to calculate
>>>>> the orbit of the moon?
>>>>> 
>>>> 
>>>> He didn’t.
>>> 
>>> I read yesterday that they use the centrifugal force to compute the
>>> orbital period. I can dig out the link if you want me to.
>> 
>> Still, Newton didn't use centrifugal force to calculate orbits. In fact 
>> he proved no such force was necessary. Certainly you can use a 
>> fictitious force as a shortcut if it makes calculations easier.
> 
> Google it: you’ll find that they use the centrifugal force to calculate
> the orbiting period of a satellite.
> 



-- 
Odd Bodkin — Maker of fine toys, tools, tables

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