Available Languages: English, Spanish, French

This is a freely downloadable physics textbook exploring mechanics, thermodynamics, electromagnetism, special and general relativity, quantum theory, and modern unification attempts. The central theme is the importance of motion and the understanding of motion in both modern and classical physics. Throughout the text, the author tries to spark interest and challenge the reader through diversions into applications and modern research questions. Although conceptual and non-mathematical, the text uses some of the most modern research questions as examples. The three main sections of the book cover classical physics, quantum physics, and unification theories and spacetime.