Definition of physics Physics deals with matter ,energy and their interactions Physics, the study of matter and energy, is an ancient and broad field of science. History of Physics The word 'physics' comes from the Greek 'knowledge of nature,' and in general, the field aims to analyze and understand the natural phenomena of the universe. Physics was known as natural philosophy until the late 18th century. Physics is the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms. Galileo has been called the "father of modern observational astronomy", the father of modern physics", the "father of science", and "the father of modern science". Isaac Newton the first physicist. Isaac Newton is popularly remembered as the man ...