Re: Fallout 3 no longer banned in Australia

"Dimensional Traveler" <dtravel@xxxxxxxxx> wrote in
news:48c1b57b$0$17230$742ec2ed@xxxxxxxxxxxxxx:

Gravity is as much a "Theory" as the Strong Nuclear Force, the Weak
Nuclear Force and Electromagnitism. They are as "proven" as gravity
is.


What do you think would happen to the chair without gravity then?

http://physics.about.com/od/physics101thebasics/f/fund_forces.htm

Question: What are the Fundamental Forces of Physics?

Sometimes there are references to the "four fundamental forces of
physics." What are the fundamental forces? Why are they fundamental?

Answer: The fundamental forces (or fundamental interactions) of physics
are the ways that individual particles interact with each other. It turns
out that for every single interaction that we've observed take place in
the universe, they can be broken down to be described by only four (well,
generally four - more on that later) types of interactions:

* Gravity
* Electromagnetism
* Weak Interaction (or Weak Nuclear Force)
* Strong Interaction (or Strong Nuclear Force)

Gravity
Of these forces, gravity has the furthest reach but it's the weakest in
actual magnitude.

It is a purely attractive force which reaches through even the "empty"
void of space to draw two masses toward each other. It keeps the planets
in orbit around the sun and the moon in orbit around the Earth.

Gravitation is described under the theory of general relativity, which
defines it as the curvature of spacetime around an object of mass. This
curvature, in turn, creates a situation where the path of least energy is
toward the other object of mass.
Electromagnetism
Electromagnetism is the interaction of particles with an electrical
charge. Charged particles at rest interact through electrostatic forces,
while in motion they interact through both electrical and magnetic
forces.

For a long time, the electric and magnetic forces were considered to be
different forces, but they were finally unified by James Clerk Maxwell in
1864, under Maxwell's equations. In the 1940s, quantum electrodynamics
consolidated electromagnetism with quantum physics.

Electromagnetism is perhaps the most obviously prevalent force in our
world, as it can affect things at a reasonable distance and with a fair
amount of force.
Weak Interaction
The weak interaction is a very powerful force that acts on the scale of
the atomic nucleus. It causes phenomena such as beta decay. It has been
consolidated with electromagnetism as a single interaction called the
"electroweak interaction."
Strong Interaction
The strongest of the forces is the aptly-named strong interaction, which
is the force that, among other things, keeps nucleons (protons &
neutrons) bound together. In the helium atom, for example, it is strong
enough to bind two protons together despite the fact that their positive
electrical charges cause them to repulse each other.

In essence, the strong interaction allows particles called gluons to bind
together quarks to create the nucleons in the first place. Gluons can
also interact with other gluons, which gives the strong interaction a
theoretically infinite distance, although it's major manifestations are
all at the subatomic level.
Unifying the Fundamental Forces
Many physicists believe that all four of the fundamental forces are, in
fact, the manifestations of a single underlying (or unified) force which
has yet to be discovered. Just as electricity, magnetism, and the weak
force were unified into the electroweak interaction, they work to unify
all of the fundamental forces.

The current quantum mechanical interpretation of these forces is that the
particles do not interact directly, but rather manifest virtual particles
that mediate the actual interactions. All of the forces except for
gravity have been consolidated into this "Standard Model" of interaction.

The effort to unify gravity with the other three fundamental forces is
called quantum gravity. It postulates the existence of a virtual particle
called the graviton, which would be the mediating element in gravity
interactions. To date, gravitons have not been detected and no theories
of quantum gravity have been successful or universally adopted.
More Physics Q&A
Fundamental Forces of Physics - related concepts

Fundamentals of ParticlesQuantum Physics: An Overview
Fundamental Forces of Physics - related theories

Newton's Law of GravityElectromagneticsTheory of General Relativity
Fundamental Forces of Physics - grand theories of everything

Unified Field TheoryString TheoryQuantum Gravity
.

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