People's Education Edition Liquan County, Xianyang City is an ordinary county with a rapid development of education. Different versions of teaching materials are used, such as People's Education Edition and Soviet Education Edition. As of July 19, 2023, all the textbooks used in physics in the second year of junior high school in Liquan County are PEP textbooks. Physics is a subject that studies the most common laws of motion and the basic structure of matter. Physics studies the most basic forms and laws of motion of everything from the universe to elementary particles, so it becomes the research basis of other natural science disciplines.