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To: RadioAstronomer

I never understand what you are driving at - LOL. But I assume you mean there are different types of gravity but you don't deny gravity exists.


355 posted on 01/04/2006 5:56:46 AM PST by mlc9852
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To: mlc9852
I never understand what you are driving at - LOL. But I assume you mean there are different types of gravity but you don't deny gravity exists.

Hmmm.. First my apologies for not being more clear on this. Lets see....

Newton came up with a mathematical formula that described a falling object or a planet in orbit around the Sun, etc. We call this force Gravity.

Newton’s Law of Universal Gravitation

"Every object in the universe attracts every other object with a force directed along the line of centers for the two objects that is proportional to the product of their masses and inversely proportional to the square of the separation between the two objects."

F=Gm1m2/r2

Where:

F equals the gravitational force between two objects
m1 equals the mass of the first object
m2 equals the mass of the second object
R equals the distance between the objects
G equals the universal constant of gravitation = (6.6726 )* 10-11 N*m2/kg2 (which is still being refined and tested today)

(BTW this is a simple form of the equation and is only applied to point sources. Usually it is expressed as a vector equation)

Even though it works well for most practical purposes, this formulation has problems.

A few of the problems are:

It shows the change is gravitational force is transmitted instantaneously (Violates C), assumes an absolute space and time (this contradicts Special Relativity), etc.

Enter Einstein’s General Theory of Relativity

In 1915 Einstein developed a new theory of gravity called General Relativity.

A number of experiments showed this theory explained some of the problems with the classical Newtonian model (Law of Gravity). However, this theory like all others is still being explored and tested.

364 posted on 01/04/2006 6:27:24 AM PST by RadioAstronomer (Senior member of Darwin Central)
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