Carl, I am giving you a "like" for that.<div>Tom Hollings<br>
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----Original Message----<br>
From: cj@mb-soft.com<br>
Date: 09/06/2017 19:20<br>
To: <physics@tuks.nl><br>
Subj: [Physics] Comment<br>
<br>
<div><span style="font-family: Arial; font-size: 10pt;">I see more of why I do not belong in your
conversations. I had been given an extensive education in Physics, so I
have some knowledge that "non-physicists" can not have.</span></div>
<div><span style="font-family: Arial; font-size: 10pt;"></span> </div>
<div><span style="font-family: Arial; font-size: 10pt;">Regarding your recent conversation, you again have
confused "gravitational force" with what is popularly called "gravity".
Newton explained that when any two objects which have mass, are at a specific
distance apart, they DO have a "gravitational force" on each other, per his
formula which you all acknowledge.</span></div>
<div><span style="font-family: Arial; font-size: 10pt;"></span> </div>
<div><span style="font-family: Arial; font-size: 10pt;">However, the enttity which is popularly called
"gravity" is more correctly called a "gravitational field" (which is technically
NOT a "force") </span></div>
<div><span style="font-family: Arial; font-size: 10pt;"></span> </div>
<div><span style="font-family: Arial; font-size: 10pt;">In addition, the "gravity" is technically also NOT
precisely the quantity that the public accepts. Because our planet has TWO
rather massive objects in it, the Earth and the Moon, some more advanced Tensor
Calculus needs to e used to calculate the instantaneous value of the
"acceleration due to gravity". Specifically, YOUR weight is actually
measurably different at different times of the day. At "moonrise" and
"moonset", your weight is nearly entirely due to the mass of the Earth.
However, around halfway between, you actually weigh less when the Moon is
nearest the zenith, and greatest when the Moon is at its nadir. This
actually greatly affects the attempts at very precisely measuring "big G" such
that the dozen experimental measurements over recent decades are NOT precisely
known, as those dozen calculated values for Big G are amazingly different from
each other. All those experiments SHOULD HAVE considered these
effects of the location of the Earth-Moon Barycenter, which requires that
Calculus, such that the various experiments would have resulted in essentially
identical mathematical results. Even some scientists do not seem to
correctly know the difference between "gravity" and "gravitational force".
Kind of sad.</span></div>
<div><span style="font-family: Arial; font-size: 10pt;"></span> </div>
<div><span style="font-family: Arial; font-size: 10pt;">It is vaguely similar to the common
misunderstanding between "centripetal force" which IS a force, and "centrifugal
effect" which does not actually even exist.</span></div>
<div><span style="font-family: Arial; font-size: 10pt;"></span> </div>
<div><span style="font-family: Arial; font-size: 10pt;">Carl Johnson</span></div>
<div> </div>
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