How is gravity Understood?

Question

A large ball attracts us by pulling us down. Inside the ball is a smaller ball that attracts the outer shell,thatn inside that ball is stil a smaller ball that does the same as the previous one till we reach a limit the ball is now the size of a golf ball and it behave as a black hole which will attract to it the larger outer shell. and what 's inside that golf ball volume that gives it the property to pull and suck mass toward it requires black hole tecknology?Such a mass would have a fantastic curvature.?

Answer 1

I am uncertain about your example, but your question, as I understand it, is "How is gravity understood", to which I can only reply, it is understood to the degree that it is (which isn't much) by observation.

Basic Newtonian Gravity (the guy with the falling apple, not the delicious Fig cookies) did not, to my understanding, really offer a 'Why', per se, it only discussed the observable phenomenon that mass attracts mass. There was the belief that it was a force, but it was problematic because it seemed to affect it's at a distance instantaneously.

Einstein doesn't seem to see Gravity as a force, as much as the result of mass pressing against the dimension(s) of space. (Mind you, our sense of 'down' is not the same thing as Gravities. Important distinction.) By 'bending' space, Gravity causes items to be drawn towards each other at a distance, similar to (in a three dimension model) weights on a trampoline.

Current theories hint that space does have a tensile strength of it's own, and that it might be increasing. This could become a real problem for us on the cosmic, as well as quantum level, as our very survival depends on the this particular law of nature remaining fairly constant.



Scary stuff.

Hope this helps.

Answer 2

Don't think of gravity as one thing attracting another. Think of gravity as everything attracting everything else.

For example, suppose the metal core in the middle of the Earth were hollow. As long as the same amount of mass were around, this would make NO DIFFERENCE. And inside the hollow space, you would find that since there is an equal amount of mass on all sides pulling at you, you will experience no net gravitation... it would be like being in free fall or in space.

Another example is that you can plot the centre of mass between you and the Earth - just as the Earth sticks you to the surface, so too do you cause deviations in the movement of the Earth. If you do the calulations, you'll find that the perturbations that you cause are so small as to be unnoticable, but they are NOT zero!

Likewise, there are acutally variations in gravitational pull in different locations on the Earth's surface. Mass is not distributed completely equally, just more or less so. Because most of the crust 'floats' on fluid magma, things that stick way above the crust (mountains) also stick way below to provide enough bouyancy to hold them up. Precise enough instuments can and do measure slightly higher gravitational pull on mountains as opposed to valleys!

So there's lots that's been worked out about gravity, even if no one knows EXACTLY how gravity is transmitted, how fast it moves, and other such fine details that physicists worry about but few other people do. Hope that helps!

Answer 3

Gravity is understood, as I remeber, as the force of anything with mass greater than that of air being pulled down by the slow rotation of the earth.

Answer 4

Is this a question?