The broadest concept that includes everything around us and our body is the matter. It is impossible to give a usual logical definition of matter, in which a broader concept is given, and then a sign of the object of definition is stated since no broader concept than matter. Therefore, instead of giving definition, it is often said that the matter was the objective reality given us in sensations.
The matter does not exist without impermanence. The impermanence is understood to be all the changes and processes taking place in the Universe. Conventionally, different and four types can represent various forms of the im-permanence: physical, chemical, biological, and social. This makes it possible to classify different sciences depending on what type of impermanence they are studying. Physics studies the physical form of matter motion.
In more detail, the physical form of impermanence can be subdivided into mechanical, molecular-thermal, electromagnetic, nuclear, and intra-nuclear ones. Surely, this division is agreed. Nevertheless, physics as an academic discipline is usually represented by the foregoing sections.
Physics, like other sciences, uses different methods of research, but all they correspond ultimately to the unity of theory and practice and reflect the general scientific approach to cognition of the surrounding reality: observation, thinking and experiment. On the basis of observations, theories are created, laws and hypotheses are formulated; after that they are tested and used in practice. Practice is a criterion of theories, it makes it possible to define them more precisely. New theories and laws are formulated; they are tested by practice again. In this way, a person advances to more perfect understanding of the world around him or her.