There are some unanswered questions in modern physics that modern physics does not have answers for, that it is due to the inability of theories. Some physicists believe that by combining general relativity and quantum mechanics, these problems may be resolved and the unanswered questions will be answered. In all of these efforts, the classical physic has been ignored, while nature is unique and all physical phenomena, from the microscopic or the macroscopic ones are obeying the same law. Therefore to solve the contemporary physics problems, in this book from a new approach, the basic concepts and relations of modern physics are reviewed and analyzed. Then, three contemporary theories which combine constructs from several different theoretical perspectives are described to show how classical mechanics, relativity and quantum mechanics can be combined coherently.