Re: GRAVITY IS NOT A FORCE

uri, aka Danny, wrote [Mar 13]:
I think gravity is pressure caused by heat and density. Gravity behaves
very much like space plasma in my opinion.


uri, aka Danny, wrote [Feb 16]:
> I think gravity is caused by the moving earth's core which generates
> energy.
>

I think Danny is a Troll!



Giving Danny the benefit of the doubt, see:
http://scienceworld.wolfram.com/physics/GravitationalForce.html
http://scienceworld.wolfram.com/physics/Gravity.html

Ref: Hartle, "Gravity: An Introduction to Einstein's General Relativity", Addison Wesley (2003)

"A few properties of the gravitational interaction that help explain when
gravity is important can already be seen from the gravitational force law

F_grav = G m_1 m_2 / r_12^2

o Gravity is a universal interaction in Newtonian theory between all mass, and,
since E = mc^2, in relativistic gravity between all forms of energy.

o Gravity is unscreened. There are no negative gravitational charges to cancel
positive ones, and therefore it is not possible to shield (screen) the gravitational
interaction. Gravity is always attractive.

o Gravity is a long-range interaction. The Newtonian force law is a 1/r^2
interaction. There is no length scale that sets a range for gravitational
interactions as there is for the strong and weak interactions.

o Gravity is the weakest of the four fundamental interactions acting between
individual elementary particles at accessible energy scales. The ratio of
the gravitational attraction to the electromagnetic repulsion between two
protons separated by a distance r is

F_grav G m_p^2 / r^2 G m_p^2
-------- = -------------------- = ------------- ~ 10^-36
F_elec e^2 / (4 pi e_0 r^2) (e^2/4pi e_0)

where m_p is the mass of the proton and e is its charge.

These four facts explain a great deal about the role gravity plays in physical
phenomena. They explain, for example, why, although it is the weakest force,
gravity governs the organization of the universe on the largest distance
scales of astrophysics and cosmology. These distance scales are far beyond
the subatomic ranges of the strong and the weak interactions. Electromagnetic
interactions COULD be long range were there any large-scale objects with net
electric charge. But the universe is electrically neutral, and electromagnetic
forces are so much stronger than gravitational forces that any large-scale net
charge is quickly neutralized. Gravity is left to govern the structure of the
universe on the largest scales.

For a more thorough comparison see: Observational and Experimental
Evidence Bearing on General Relativity
http://math.ucr.edu/home/baez/RelWWW/tests.html
.

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