Physics is a science that deals with the material objects of the universe (mass, force, energy, charge etc.) It aims to express the laws of the universe in terms of mathematical equations. These laws are believed to predict all the phenomena that take part in the universe.
Physicists are trying to formulate a Grand Unified Theory that alone will govern all the natural phenomena. But it would require incredible effort to do so at once. So physicists take the shorter and easier way, they began to find partial laws which predicts some limited phenomena. Some of the most successful partial theories are Law of Gravitation, Electromagnetic Theory, General Relativity, Quantum Theory etc. At present physicists are trying to unify General Relativity and Quantum Theory.
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