# Gravity Question

1. Jul 12, 2004

### imi

Can the theory of gravity be simplified to the attraction of two particles (always of equal mass) rather than the attraction of two massive objects?

If so would the relationship of gravitational attraction have to be calculated according to the relative position of all particles in an object in order to be completely accurate?

2. Jul 12, 2004

### Eyesaw

Seems that way if gravitational attraction is a function of how much mass is present. That's why the center of gravity is different for differently shaped objects.

3. Jul 13, 2004

### Integral

Staff Emeritus
In general the computation of gravitation attraction between 2 arbitrary bodies takes the form of an integral, where each body is subdivided into infinitesimal mass elements. This approach can correctly compute the attraction between bodies which do not have uniform mass distributions.

4. Jul 13, 2004

gravity is a basic attraction between two particles. It is the weakes fore of the 4 elementary forces in the universe; gravitational, electromagnetic, weak nuclear and stong nuclear. It is actually millions of times weaker than the other three, but since matter is made up od soo many billions and billions of particles, the gravitational forces add up and dominate in the large scale world.

5. Jul 13, 2004

### sol2

Is there a way to measure the "continuity" of the strength and weakness of gravity topologically?

I have placed GRACE here in posts for consideration to reveal the topological features of earth

http://www.csr.utexas.edu/grace/gallery/gravity/03_07_GRACE2.jpg
These detailed geophysical features are being detected by GRACE with no surface gravity measurements. (July 21, 2003)

http://www.csr.utexas.edu/grace/gallery/animations/world_gravity/

I have also place information in terms of gravity Probe B in other posts. Sci physics strings as well