What are the four primary forces of the universe, is gravity, weak nuclear, strong nuclear, and one other?

Question

And can you explain what weak nuclear and strong nuclear are?

Answer 1

Electricty is the fourth fundamental force.
The other forces are:
1. electricity
2. magnetism
3. the weak and strong nuclear forces.
4. gravity

The weak and strong nuclear forces, magnetism and electricity (the first 3 forces) have all been found to be based on the electron and so are forms of electricity. According to Einstein's Unified Field Theory that means gravity should also be a form of electricity, but so far we haven't found a connection.

The strong nuclear force is what holds the neutrons and protons together using gluons.

The weak nuclear force is what keeps the electrons together.

According to Wikipedia: http://en.wikipedia.org/wiki/Strong_nuclear_force
"The strong interaction or strong force http://en.wikipedia.org/wiki/Strong_nuclear_forceis today understood to represent the interactions between quarks and gluons as detailed by the theory of quantum chromodynamics (QCD). The strong force is the fundamental force mediated by gluons, acting upon quarks, antiquarks, and the gluons themselves.

The strong force only acts directly upon elementary particles. However, a residual of the force is observed between hadrons (the best known example being the force that acts between nucleons in atomic nuclei) as the nuclear force. Here the strong force acts indirectly, transmitted as gluons which form part of the virtual pi and rho mesons which classically transmit the nuclear force (see this topic for more). As has been shown by many failed free quark searches, the elementary particles affected are unobservable directly. This phenomenon is called confinement, a theory which allows only hadrons to be seen."

According to Wikipedia: http://en.wikipedia.org/wiki/Weak_nuclear_force
“The weak interaction (often called the weak force or sometimes the weak nuclear force) is one of the four fundamental interactions of nature. In the Standard Model of particle physics, it is due to the exchange of the heavy W and Z bosons. Its most familiar effect is beta decay (of neutrons in atomic nuclei) and the associated radioactivity. The word "weak" derives from the fact that the field strength is some 1013 times less than that of the strong force.

The weak interaction affects all left-handed leptons and quarks. It is the only force affecting neutrinos (except for gravitation, which is negligible on laboratory scales).”

Answer 2

Four Forces In The Universe

Answer 3

Electromagnetism?

Answer 4

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