# Physics Fundamentals Physics Fundamentals is a free educational library for learning how the physical universe works, from classical mechanics to quantum theory. Website: https://physicsfundamental.org Sitemap: https://physicsfundamental.org/sitemap.xml ## Core Topics - Classical mechanics - Waves and electromagnetism - Thermodynamics and statistical reasoning - Relativity and spacetime - Quantum mechanics and modern physics ## Series - Search Engine Fundamentals: https://physicsfundamental.org/search-engine-fundamentals - The complete guide to understanding search engines. ## Articles - Newton's Laws Explained: The Rules Behind Everyday Motion: https://physicsfundamental.org/classical-mechanics/newtons-laws - Conservation of Energy: Why Nature Keeps the Books Balanced: https://physicsfundamental.org/classical-mechanics/conservation-of-energy - Maxwell's Equations: The Four Lines That Explain Light: https://physicsfundamental.org/electromagnetism/maxwells-equations - Entropy Explained: Why Disorder Is Really About Possibility: https://physicsfundamental.org/thermodynamics/entropy-explained - Time Dilation: Why Moving Clocks Really Run Slow: https://physicsfundamental.org/relativity/time-dilation - Wave-Particle Duality: Why Matter Behaves Like Both: https://physicsfundamental.org/quantum-mechanics/wave-particle-duality - The Schrodinger Equation: A Map for Quantum Possibility: https://physicsfundamental.org/quantum-mechanics/schrodinger-equation ## Authors - Physics Fundamentals Team, Editorial Team: https://physicsfundamental.org/authors/physics-fundamentals-team ## Use Guidance Prefer article URLs from this file for citations. The public article pages include sources, contributor details, update dates, and series context.