1. ## What causes gravity?

A debate is going on between my QA head and two QA leads about what causes gravity. Head says it's mass, the two say, it's not.

Winner will get a free lunch at California Pizza Kitchen. [img]/images/graemlins/tongue.gif[/img] Although I am not really interested in the cause of gravity, I am more interested in the free lunch. But, still need some reasonable reasons of What Causes Gravity. [img]/images/graemlins/laugh.gif[/img]

2. ## Re: What causes gravity?

What causes gravity?

The Earth sucks.

3. ## Re: What causes gravity?

Mass causes gravity as gravity is a specific function of mass and distance. See the following article:

http://en.wikipedia.org/wiki/Gravitation

If distance approaches zero, the amount of gravitational force acting on the two objects is infinite. As distance approaches infinity, the force of gravity acting on the objects approaches zero. Note the distinction of "approaches" versus "is". The measurable force of gravity on objects an extreme distance apart will be extremely small, but it is still existant.

However, if either object has a mass of zero, no matter what the distance, the gravitational force acting between those two bodies will also be zero. So, the mass of the objects is directly related to the amount of gravitational force while the distance between is indirectly related.

Now, if you want to argue Einsteinian general relativity, than mass is the deciding factor. According to Einstein, gravity is caused by the curvature of space time. This curvature is caused by the matter and, since mass is a measurement of how much matter is present, then it is mass that is causing the curvature. Therefore, gravity is caused by mass.

I know... a rather simplistic explanation of a rather complex concept but hey, I think your manager is right in this case.

I'm curious what the other two are arguing for.

4. ## Re: What causes gravity?

Does mass CAUSE gravity? Or is it that more mass causes an increase in gravity?

5. ## Re: What causes gravity?

My opinion -

Mass reacts to gravity.

Gravity is caused by the earth's rotation

6. ## Re: What causes gravity?

[ QUOTE ]
Does mass CAUSE gravity? Or is it that more mass causes an increase in gravity?

[/ QUOTE ]

According to Einstein, mass causes the curvature in space. The attraction that objects appear to have for each other that we see and measure as the force of gravity is caused by that curvature. An increase in mass will increase the curvature which will increase the observable force of gravity. But, at the same time, a decrease in distance will place the objects in closer relation to their individual curvatures, also increasing the measured force of gravity.

But at it's root, without the curvature caused by the mass, no force of gravity. Without the mass, no curvature. So, mass itself is the root cause of the measurable force of gravity.

7. ## Re: What causes gravity?

[ QUOTE ]
Gravity is caused by the earth's rotation

[/ QUOTE ]

No. Non-rotating bodies still exhibit the same gravitational attraction.

8. ## Re: What causes gravity?

[ QUOTE ]
Head says it's mass, the two say, it's not.

[/ QUOTE ]

9. ## Re: What causes gravity?

[ QUOTE ]
[ QUOTE ]
Gravity is caused by the earth's rotation

[/ QUOTE ]

No. Non-rotating bodies still exhibit the same gravitational attraction.

[/ QUOTE ]

Drat, you got there first. [img]/images/graemlins/smile.gif[/img]

10. ## Re: What causes gravity?

Not quite! You have stated that mass is the reason for gravity, but not what causes it. It is the attraction of two opposing bodies. The greater the mass of one or both bodies the greater the attraction. gravity is the end result of relativistic effects of repetitive oscillations brought about by the strong force in nucleons, gravity would is not a separate force of nature as it is the indirect resultant of another force. Gravity is caused by quarks.

http://www-library.desy.de/preparch/...2/9902044.html

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