What are the roles of "Electromagnetic Force," "Weak Nuclear Force,"
"Strong Nuclear Force," and "Gravitational Force" in the Ultimate Fate
of the Universe?

These forces will work together to create the Ultimate End Game Show. Really.

The "Ultimate Fate of the Universe" is a pretty broad term. If I
remember, people think that one of two things will happen.

The universe will continue to expand forever.

The universe will eventually start contracting. When the universe
contracts fully it will end up in a huge cataclysmic crunch.

If the first result happens then we can predict that the only force
that will have any play in this is the gravitational force. The
nuclear forces are extremely localized, so won't play any great role.
While electromagnetic and gravitational forces theoretically will
exert force out untill you get to infinity distance away, if the
universe never contracts then clearly this won't be a problem. So,
stuff will just spin off into the void, and these forces won't have a
big impact at all.

The second is a different story. However, I don't think the forces
would play much of a role anyway. Once gravity (or maybe just the
curve of the space-time continuum) has caused the eventual collapse of
all matter back on itself we're talking about the biggest
gravitational force ever. It'll be stronger than the strongest black
hole. However, we can't really tell. At that point the universe would
be so distorted from what we know (physics is a deductive science)
that we wouldn't even know if we could apply these forces in the final
end-game in my opinion. But, just for your edification, in high-energy
plasmas the energy of the particles of the system are great enough to
break the weak nuclear force, and I think strong enough to break the
strong nuclear force. Thus, we can speculate that there will be so
much frictional heating in this huge collapse that the plasma formed
in it's wake will laugh at the four fundamental forces and they won't
come into much play.

One of the big challenges in physics is to show that the strong, weak and
electromagnetic forces are all variations of a so called Grand Unified
Force.  Theories that attempt to do this are called Grand Unified Theories,
or GUTs.  There are no complete GUTs yet, but some of the current ones
predict that protons are unstable.  Experiments are showing that the half
life of the proton is not less than 10E34 years, so it needs a pretty
pedantic definition of "unstable"!  On the other hand, the universe is
patient!  So, if GUTs are to be believed, all the matter in the universe
will decay until there's just a thin soup of energy and fundamental
particles.

The universe has been expanding since the big bang. Until the last few
years, it was believed that there was exactly enough mass-energy in the
universe so that its gravity would bring the expansion to a halt in
infinite time.  Recent developments are showing that there's a "dark
energy" which is causing the expansion to speed up - the jury's still out
on what that means!

Ian G.

If the universe is expanding it will eventually dissappate. If it is
contracting eventually it will be a big heavy pre-big bang proto star.
Also there is the oscillating universe theory, where it expands to a
certain size then contracts back upon itself every however many
billion years sounds convenient at the time. There is another solution
to these problems.

It is called the steady state universe theory. That everything stays
pretty well the same. Most scientists do not like this because it is
not complicated enough. Likely I will get flamed for even mentioning
it. I like the steady theory because it solves the aforementioned
worries. Also explains that pesky granite thing.

i suggest you read "A Brief History Of Time" from stephen hawkings.
(please dont mind if the spelling is incorrect)

No one knows.  Are there boundaries?  If there is, who is to say that
the shape of the mass wont instantly change, from a spere to a cube,
for instance.  What is a boundry? If there is a boundry, doesnt that
mean that there is something else outside of that boundry, and
therefore more universe beyond?

tederick mentioned that the steady state theory is not accepted
because it is not complicated enough. This is not true, one reason for
the big bang theory is because Hubble measured a red shift in the
light of other galaxies. Redshift is a result of light waves
increasing in length, making it appear redder. It can be compared to
the doppler effect, which corisponds to sound,  a police sirens coming
towords you has a higher pitch because the sound waves are closer
together, and lower when the sirens are moving away because of the
increased distance in the wave. Hubble attributed the red shift found
from MOST galaxies because they are moving away from us.