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Author Topic: gravity  (Read 5647 times)

Offline mrfinger6

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gravity
« on: 29/12/2005 01:29:11 »
Is it possable that gravity is a push and not a pull?


 

Offline Soul Surfer

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Re: gravity
« Reply #1 on: 29/12/2005 10:14:18 »
No

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evolution rules in all things
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Offline DocN

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Re: gravity
« Reply #2 on: 29/12/2005 21:50:41 »
Could such a quantum-string particle (graviton) and its interactions and movements result in quantum-like vaccumm states?  We do find other quantum particles capable of "pulling" other particles together.
DocN

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Offline harryneild

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Re: gravity
« Reply #3 on: 30/12/2005 00:39:47 »
what is anti-gravity then because i would have thought that it was a type of gravity that pushes. Can't anti-gravity somehow be used to open up tiny wormholes in the foam of space time or something. Would appreciate any help on this topic.
 

Offline ukmicky

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Re: gravity
« Reply #4 on: 30/12/2005 01:49:37 »


Anti gravity is theoretical but some believe possible,

Dark matter could be formed from baryonic matter which your made from or non baryonic matter like neutrinos, wimps, super wimps, gravitinos neutralinos, axions, photinos, to name a few. So who knows what’s possible.
Remember lots of things begin there lives as theoretical.



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« Last Edit: 30/12/2005 01:57:03 by ukmicky »
 

another_someone

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Re: gravity
« Reply #5 on: 30/12/2005 04:49:06 »
quote:
Originally posted by ukmicky

Anti gravity is theoretical but some believe possible,



Most forces that have opposites, like repels like and opposites attract.  Since, with ordinary gravity, like attracts like, then are you suggesting it would be a reversal of the ordinary convention, and one would have a repulsion of opposites (and by inference, matter with anti-gravity would attract other matter that has anti-gravity).

Also, if anti-gravity does exist, and if it repels matter that has a gravitational field, it could be quite troublesome getting down to Earth against the force of the Earth's gravitational field (ofcourse, that may be the reason we don't readily find it on Earth at present).
« Last Edit: 30/12/2005 04:51:27 by another_someone »
 

Offline DocN

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Re: gravity
« Reply #6 on: 31/12/2005 20:56:49 »
I wonder if a state of spacetime opposite to that of a blackhole, could exist--that is the repellent condition of matter?
DocN

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Offline DocN

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Re: gravity
« Reply #7 on: 11/01/2006 17:15:23 »
It is interesting to consider the possibility that if one considers gravitational energy as "negative energy" and therefore, inorder to produce an anti-gravity state, could a quantum vacuum output a form of negative energy?
Doc
 

Offline Solvay_1927

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Re: gravity
« Reply #8 on: 14/01/2006 02:00:32 »
quote:
Originally posted by DocN

I wonder if a state of spacetime opposite to that of a blackhole, could exist--that is the repellent condition of matter?


Try doing a google search on "white holes".
(It'll give you links like the following...)
http://curious.astro.cornell.edu/question.php?number=108
 

Offline harryneild

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Re: gravity
« Reply #9 on: 15/01/2006 22:45:47 »
If the fact that matter and energy cannot be created or destroyed is true then where does the energy for gravitaional pull come from?
 

Offline ukmicky

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Re: gravity
« Reply #10 on: 15/01/2006 23:28:13 »
Good question,  i'm guessing. I presume it comes from the fabric of space itself, as even an empty vacuum is supposed to contain energy.

Best wait for a clever person to anwser though:)

Michael                 HAPPY NEW YEAR                    
« Last Edit: 16/01/2006 01:30:41 by ukmicky »
 

Offline Soul Surfer

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Re: gravity
« Reply #11 on: 16/01/2006 00:00:46 »
The creation of the gravitational field does not require any continuos expending of energy only the existence of a chunk of mass energy that is creating the gravitational field. if another body (assumed to be of insignificant mass with respect to the main attracting body) moves into an area where the value of the gravitational field is significant enough for attractive motion to become significant the energy of the object in the field is deemed to be potential energy as the motion of the body falls down the poential well bthe field generates.  As the body accelerates it exchanges some of this potential enrtgy into kinetic energy of motion.  as the body moved into the vicinity of the field it was clearly moving before this attraction became significant.  assimoing that this motion was not initially directly towards the attracting object the object also posessed some angular momentum with respect to the main atteacting object  this angular momentum qwill be conserved and the smaller body will perform a hyperbolic orbit around the main object and decelerate giving up kinetic energy and gainig potrential energy with respect to the main attracting body as it moves away never to return

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Offline ukmicky

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Re: gravity
« Reply #12 on: 16/01/2006 01:29:11 »
As i said best wait for a clever person, i knew one would come along

But just out of interest what is this

 zero point energy and vacuum energy, are they the same and what are they.

Michael                 HAPPY NEW YEAR                    
« Last Edit: 16/01/2006 01:41:14 by ukmicky »
 

Offline harryneild

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Re: gravity
« Reply #13 on: 16/01/2006 10:31:59 »
Does Einstein's analogy of a person accelerating in an elevator being identical to a person standing in a gravtiational field show that when we are in a gravitational feild and are still relative to the large mass then we are constantly moving through space at an ever accelerating speed. If space is dragged into a large body then where does it go?
 

Offline DocN

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Re: gravity
« Reply #14 on: 16/01/2006 16:36:18 »
The person accelerating in an elevator (blacked out), is in outerspace away from any large, attracting mass but would be unaware of the situation and still believe that a "force" of gravity was in force because of some mass.  If in a falling (blacked out) elevator near a large mass, the person would believe that gravity was not in force since if he or she dropped say a book, it would appear to "float".  To Einstein, there is no force of gravity--just the curvature of spacetime because of mass.
Doc
 

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Re: gravity
« Reply #14 on: 16/01/2006 16:36:18 »

 

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