Physics is that branch of Science in which we study about the matter energy, push, pull etc.  In other words by studying Physics we come to know about how the universe  and its physical phenomena works. The word physics has been taken out of a Greek word Physike which refers to the meaning knowledge of nature. The major topics which we study in physics are space and time, thermodynamics, Geo physics etc. The famous scientist of Physics are Isaac Newton and Galileo galilei.