From: PointedEars@web.de
Ruben Safir wrote:
> Thomas 'PointedEars' Lahn wrote:
>> Popping Mad wrote:
>>> On 12/7/25 11:35 AM, Thomas 'PointedEars' Lahn wrote:
>>>> Thomas 'PointedEars' Lahn wrote:
>>>>> First of all, it is not good to think of gravitation as a property of an
>>>>> object as in "Earth *has* gravity". That is NOT how it works. [This is
>>>>> frequently taught wrong in schools.] Instead, it is an *interaction*
>>>>> _between_ objects. According to Newton's theory, objects _attract each
>>>>> other_ because they have non-zero mass. So (according to Newton) it is
not
>>>>> so that "earth does gravity" but that Terra (_Earth_) has non-zero mass,
>>>>
>>>> ["non-zero X" simply means "X is not equal to zero"]
>>>>
>>>>> and so do other objects (including people like you and me), and so
everything
>>>>> is attracted to everything else. (As the story goes, he realized that
an apple
>>>>> and Earth attract each other in the same as Earth and the Moon attract
each
>>>> ^^^^^^^^^^^
>>>> in the same _way_
>>>>
>>>>> other, and Earth and the Sun are attracted to each other: Gravitation was
>>>>> *universal*, not limited to Earth. Thus he could also explain how
Kepler's
>>>>> planetary orbits arose, and predict them.)
>>>>>
>
> You are rambling and you are off topic and not being helpful.
I don't care what you think because you have no clue what you are talking
about.
>>>>> [One way to understand how the magnitude of the gravitational
acceleration
>>>>> at the center of Terra is approximately zero is to consider a test object
>>>>> with a negligible non-zero mass (a "test mass") there. It will be
attracted
>>>>> gravitationally by all the matter that surrounds it (which also has
non-zero
>>>>> mass) in all directions of space approximately in the same way. So the
net
>>>>> gravitational force on it and its net gravitational acceleration are
>>>>> approximately zero.]
>>>
>>> I understand this in theory. My problem is that if an apple falls from
>>> a tree and hits you in the head, it hurts, despite that it falls from
>>> the tree because of its gravetational attraction to the Earth, not to you.
>>
>> That is not quite correct. There is also a small gravitational force
>> between the person and the apple.
>
> That is irrelevant to the point.
No, it is not. That gravitation is an interaction between *all* objects is
the key thing to understand here.
> I think you are writing to hear yourself.
I think that you are a luser who is having delusions of entitlement.
> I didn't ask or address a question about degrees of freedom of all the
> graviational forces that one can measure in this situation.
You have no clue what "degrees of freedom" are either, obviously.
> I was just trying to understand why the pressure at the center, or as one
> approaches the center of a planet increases to incredable levels which
> the actual pravatational force once experiences reaches zero.
"incradable"? "pravational"? Learn to read, then write. The sentence
above is incoherent babble, even after correcting typos.
> You are not helping at all in addressing this.
I was, you are just too self-absorbed to recognize it.
> You are all over the place.
It is a complex problem for which there is no one-line explanation. I have
answered your question correctly and broke the problem down for you as best
as I could. It is not my fault if you are not smart enough to grasp it
because you are too lazy to read.
> And your language is difficult to parse.
Not my problem. My answer is correct, and my language is exact. I even
made considerable efforts to make it easier to understand after the fact.
But you come here with a consumer attitude, and there is no pleasing you.
> No help is coming from this post on usenet.
Usenet is not a right, stupid.
And trim your quotes to the relevant minimum next time.
Score adjusted.
--
PointedEars
Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.
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