<p>The Motion Mountain Physics Text is a free and entertaining physics textbook - with more than 2000 pages - for undergraduates and anybody interested in physics. The text is guaranteed to be<br />entertaining, surprising and challenging on every page. It is a guide through the adventure of physics.</p> <p>How do objects and images move? How can animals move? What is motion? How does a rainbow form? Is levitation possible? Do time machines exist? What does 'quantum' mean? What is the maximum force value found in nature? Which problems in physics are still unsolved?</p> <p>The site publishes a free physics textbook that tells the story of how it became possible, after 2500 years of exploration, to answer such questions. With little mathematics, the text explores the most fascinating parts of mechanics, thermodynamics,<br />special and general relativity, electrodynamics, quantum theory and modern attempts at unification. The essence of these fields is summarized in the most simple terms: it is shown how they are based on the notions of<br />minimum entropy, maximum speed, maximum force, minimum change of charge and minimum action.</p> <p>The text explores the limits of time and space, and the wonders that can be discovered there. It is written in English for students, teachers, and for anybody who is interested in the precise description of nature.</p> <p>For each field of physics, the best images, the most interesting physical puzzles, the most fascinating physical