|Oct27-12, 02:04 PM||#18|
What is gravity?
look think of a blast. what happens when a blast takes place? what happens to the things near the blast took place! every thing is pushed away! or we can say the blast was a distribution of high pressure into low pressure zones! Now think of its reverse. think of a negative blast! the blast will pull things! or low pressure zone will pull high pressure into it to balance pressure. Now if we see a negative blast has the same property of gravity! so maybe gravity is negative explosion that pulls mass!
|Oct27-12, 02:15 PM||#19|
|Oct30-12, 12:25 PM||#20|
You should have posted this one in the SR/GR sub-forum...
To me, general relativity implies that gravity is the fictitious force caused by the fact that we live in universe which is curved by the presence of energy.
As an example of this understanding, one should not say that light is bent by the sun, but rather light travels on a straight line (geodesic) which appears curved in the coordinate system we use to talk about events in the universe. Analogously, flights generally travel along mostly straight lines between cities but these appear curved on the maps we use.
The Earth is not pulling you towards it. As you hurdle forward in time along your timelike geodesic, the distance between your geodesic and the Earth's geodesic is shrinking because of the spacetime curvature. You feel a force because you push against the Earth so that you maintain a constant distance from its center.
|Nov2-12, 12:42 PM||#21|
If you go with the assumption that gravity (and dark energy) live in its own dimension and space/time is essentially the surface area on this extra dimensional bubble (gravity / dark energy) then:
When this extra dimension shrinks, you get the gravity effect on the space time (i.e. space time is pulled together). When the extra dimension expands then space/time stretches. The effect on space and time by gravity and anti-gravity (dark matter) is indirect. In the example of a bolloon (the surface is space / time, the inside is gravity's dimension) if the air is added inside the balloon, the volume (gravity dimension) expands and space time stretches (dark energy), when air is removed the gravity dimension contracts and the surface of the bolloon tightens (gravity).
Just my thought is that gravity is the dimension that comes after the 3rd and that time lives in either the 1st dimension or a dimension that comes before the 1st dimension.
|Similar Threads for: What is gravity?|
|Gravity: Point where Earth's Gravity and the Moon's cancel each other out?||Advanced Physics Homework||21|
|How to calculate mass of fuel needed to escape Earth gravity vs. Mars gravity||General Astronomy||2|
|Does gravity affect gravity the way gravity affects time?||General Physics||12|
|[help]how to obtain gravity eqution from gravity field Action S?||Special & General Relativity||3|
|[help]how to obtain gravity eqution from gravity field Action S?||Advanced Physics Homework||2|