Our interactive Physics and Chemistry Tutorials are our own free textbooks, written at a high school reading level (and by teachers, not AI), with helpful images, understanding checks, and links to …

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 School Physics, …

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If you’ve mastered this content and want to explore physics at the next level, we recommend our AP Physics 1 and AP Physics 2 courses. Give us feedback on this course