[Physics] Comment

[carmam at tiscali.co.uk]

Carl, I am giving you a "like" for that.Tom Hollings



----Original Message----

From: cj at mb-soft.com

Date: 09/06/2017 19:20

To: <physics at tuks.nl>

Subj: [Physics] Comment






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.
 
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.
 
However, the enttity which is popularly called 
"gravity" is more correctly called a "gravitational field" (which is technically 
NOT a "force") 
 
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.
 
It is vaguely similar to the common 
misunderstanding between "centripetal force" which IS a force, and "centrifugal 
effect" which does not actually even exist.
 
Carl Johnson
 
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