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Physics

Understand how the world works: motion, forces, energy, light and electricity, with simulations and clear explanations.

31 free sites · 30 in English.

1. Khan Academy – Physics English khanacademy.org

   Videos and exercises from basic to advanced physics.

   For: Middle & high schoolCollege

2. PhET Simulations (University of Colorado) Multilingual phet.colorado.edu

   Interactive physics simulations.

   For: Elementary schoolMiddle & high schoolCollege

3. OpenStax – University Physics Volume 1 English openstax.org

   Free college textbook (volumes 2 and 3 too).

   For: College

4. OpenStax – College Physics 2e English openstax.org

   Free algebra-based physics textbook.

   For: College

5. HyperPhysics English hyperphysics.phy-astr.gsu.edu

   A concept map of all of physics.

   For: Middle & high schoolCollege

6. The Physics Classroom English physicsclassroom.com

   Tutorials and interactives for high school.

   For: Middle & high school

7. Isaac Physics (University of Cambridge) English isaacphysics.org

   Free problem-solving practice.

   For: Middle & high school

8. Flipping Physics English flippingphysics.com

   Fun, clear video lessons.

   For: Middle & high schoolCollege

9. oPhysics English ophysics.com

   Interactive physics simulations.

   For: Middle & high schoolCollege

10. Falstad – Simulations English falstad.com

    Waves, optics, electromagnetism and quantum mechanics.

    For: Middle & high schoolCollege

11. Walter Fendt – Physics applets English walter-fendt.de

    Simulations of mechanics, optics and electricity.

    For: Middle & high school

12. The Physics Hypertextbook English physics.info

    An online physics textbook.

    For: Middle & high schoolCollege

13. LibreTexts – Physics English phys.libretexts.org

    Large library of open physics textbooks.

    For: College

14. The Feynman Lectures on Physics English feynmanlectures.caltech.edu

    Richard Feynman’s lectures, free from Caltech.

    For: College

15. MIT OCW – 8.01 Classical Mechanics English ocw.mit.edu

    Complete MIT course.

    For: College

16. MIT OCW – 8.02 Electricity and Magnetism English ocw.mit.edu

    Complete MIT course.

    For: College

17. The Theoretical Minimum (Susskind) English theoreticalminimum.com

    Stanford courses on theoretical physics.

    For: General publicCollege

18. Crash Course (YouTube) English youtube.com

    Includes a full physics series.

    For: Middle & high schoolGeneral public

19. minutephysics (YouTube) English youtube.com

    Short, smart physics explainers.

    For: General public

20. PBS Space Time (YouTube) English youtube.com

    Modern physics, relativity and quantum.

    For: General publicCollege

21. OpenStax – University Physics Volume 2 English openstax.org

    Thermodynamics, electricity and magnetism.

    For: College

22. OpenStax – University Physics Volume 3 English openstax.org

    Optics and modern physics.

    For: College

23. OpenStax – Physics (high school) English openstax.org

    Free high school textbook.

    For: Middle & high school

24. Light and Matter (Crowell) English lightandmatter.com

    Free physics textbooks.

    For: Middle & high schoolCollege

25. Motion Mountain English motionmountain.net

    Free physics textbook series.

    For: College

26. Open Yale – Fundamentals of Physics English oyc.yale.edu

    Ramamurti Shankar’s Yale course.

    For: CollegeGeneral public

27. MIT OCW – 8.04 Quantum Physics I English ocw.mit.edu

    Complete MIT course.

    For: CollegeAdvanced

28. David Tong – Lecture notes English damtp.cam.ac.uk

    Cambridge notes on theoretical physics.

    For: Advanced

29. Veritasium (YouTube) English youtube.com

    Science and physics stories.

    For: General public

30. Sixty Symbols (YouTube) English youtube.com

    Physics explained by Nottingham scientists.

    For: General public

31. Physics Stack Exchange English physics.stackexchange.com

    Ask and answer physics questions.

    For: Middle & high schoolCollege