The physics archive contains legacy physics content, and is not being updated with new content. For our most up-to-date, mastery-enabled courses, check out Middle School Physics, High …

Let's think about what physics is and what topics are covered in an introductory physics course.

Khan Academy offers free, world-class education in physics, covering forces and motion topics.

Physics is built on a foundation of math and it seeks to explain all phenomena in the universe. It forms the basis for other sciences like chemistry and biology. Physics uses simple yet elegant …

Explore science with Khan Academy's free courses, videos, and exercises in physics, chemistry, biology, and more for a world-class education.

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Let me drop my physics textbook slightly above my desk. Because of gravity the book falls down, right, yet then it’s stopped by the desk. Now the desk exerts a normal force upon the book. …

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¡Bienvenido a las Lecciones de física! La física es el estudio de la materia, el movimiento, la energía y la fuerza. Aquí puedes explorar videos, artículos y ejercicios por tema. Mantenemos …

Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of …