Fundamental forces

A fundamental interaction or fundamental force is a mechanism by which particles interact with each other, and which cannot be explained in terms of another interaction. Every observed physical phenomenon can be explained by these interactions. The apparent irreducible nature of these interactions leads physicists to study the properties of these forces in great detail. In modern physics, there are four fundamental interactions (forces): gravitation, electromagnetism, the weak interaction, and the strong interaction. Their magnitude and behavior vary greatly, as described in the table below.
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The forces by wich the elementary particles interact with one another. The four fundamental forces which shape the universe are gravity , electromagnetism , the strong nuclear force and the weak nuclear force . Although they are distinct from one another in the present day universe, they are all thought to be slightly different aspects of the same superforce. This superforce is predicted by unified field theories and is theorised to have been active only in the first few instants following the big bang . As the universe expanded and cooled so the superforce broke up into the four fundamental forces we are familiar with today. Steps towards proving this theory begin with the unification of electromagnetism and the weak nuclear force to provide the observed electroweak force. The unification of the strong nuclear force and the electroweak force then provides the hypothetical grand unified force . After the development of a quantum theory of gravity, that too can be unified to produce the unified field superforce.