Physics

Aristotle's Physics was written in the fourth century BC. For more than two thousand years this book served as the basis of natural philosophy (physics), throughout the Middle Ages and the early modern period, up to the sixteenth century the time of Galileo.
In this book, Aristotle explains the main principles of his natural philosophy. The book deals with the subject of motion and its causes, the motion of objects from one place to another, and motion as a general concept of change of state. According to Aristotle, the motion of physical bodies is of two types: natural motion and violent motion.