| Topic: |
Science > Physics |
| User: |
"Miller" |
| Date: |
10 Mar 2006 06:02:15 PM |
| Object: |
Gravity |
While I was thinking about gravity this idea came ro me: motion is
gravity and gravity is motion. This is what holds a spinning top up.
I'm sure that somebody has probably had this idea before me but I
thought of it by myself.
.
|
|
| User: "T Wake" |
|
| Title: Re: Gravity |
10 Mar 2006 06:15:54 PM |
|
|
"Miller" <jhines1931@peoplepc.com> wrote in message
news:1142035334.993662.3130@i39g2000cwa.googlegroups.com...
While I was thinking about gravity this idea came ro me: motion is
gravity and gravity is motion.
Can you think of a way we could experiment to test this theory?
This is what holds a spinning top up.
Are you saying gravity is what holds the spinning top up?
I'm sure that somebody has probably had this idea before me but I
thought of it by myself.
Good for you.
.
|
|
|
|
| User: "Sam Wormley" |
|
| Title: Re: Gravity |
10 Mar 2006 06:15:00 PM |
|
|
Miller wrote:
While I was thinking about gravity this idea came ro me: motion is
gravity and gravity is motion. This is what holds a spinning top up.
Actually it's the table that holds the spinning top up. More
specifically the electromagnetic force between atoms. Gravity
is pulling the top down.
Here are the Fundamental Forces in nature
http://scienceworld.wolfram.com/physics/FundamentalForces.html
And here is how force can effect motion
http://scienceworld.wolfram.com/physics/Force.html
.
|
|
|
|
| User: "Sam Wormley" |
|
| Title: Re: Gravity |
10 Mar 2006 06:23:57 PM |
|
|
Miller wrote:
While I was thinking about gravity...
Ref: Hartle, "Gravity: An Introduction to Einstein's General Relativity", Addison Wesley (2003)
"A few properties of the gravitational interaction that help explain when
gravity is important can already be seen from the gravitational force law
F_grav = G m_1 m_2 / r_12^2
o Gravity is a universal interaction in Newtonian theory between all mass, and,
since E = mc^2, in relativistic gravity between all forms of energy.
o Gravity is unscreened. There are no negative gravitational charges to cancel
positive ones, and therefore it is not possible to shield (screen) the gravitational
interaction. Gravity is always attractive.
o Gravity is a long-range interaction. The Newtonian force law ia a 1/r^2
interaction. There is no length scale that sets a range for gravitational
interactions as there is for the strong and weak interactions.
o Gravity is the weakest of the four fundamental interactions acting between
individual elementary particles at accessible energy scales. The ratio of
the gravitational attraction to the electromagnetic repulsion between two
protons separated by a distance r is
F_grav G m_p^2 / r^2 G m_p^2
-------- = -------------------- = ------------- ~ 10^-36
F_elec e^2 / (4 pi e_0 r^2) (e^2/4pi e_0)
where m_p is the mass of the proton and e is its charge.
These four facts explain a great deal about the role gravity plays in physical
phenomena. They explain, for example, why, although it is the weakest force,
gravity governs the organization of the universe on the largest distance
scales of astrophysics and cosmology. These distance scales are far beyond
the subatomic ranges of the strong and the weak interactions. Electromagnetic
interactions COULD be long range were there any large-scale objects with net
electric charge. But the universe is electrically neutral, and electromagnetic
forces are so much stronger than gravitational forces that any large-scale net
charge is quickly neutralized. Gravity is left to govern the structure of the
universe on the largest scales.
For a more thorough comparison see: Observational and Experimental
Evidence Bearing on General Relativity
http://math.ucr.edu/home/baez/RelWWW/tests.html
.
|
|
|
|
|
Related Articles |
|
|
