A free, interactive first-year university physics course: calculus, mechanics, electromagnetism, waves and lab practice.
A rigorous physics course spanning single- and multivariable calculus, linear algebra, chemistry, computer science, mechanics, differential equations, electromagnetism, optics, waves, and laboratory practice — taught through short interactive lessons and practice questions.
Start this course freePhysics I is a first-year university physics course rebuilt for active learning. Instead of reading walls of text, you work through short lessons and answer questions where the diagram itself is the answer — drag a vector, release a pendulum, adjust a field, and watch the physics respond. The result is a course you do rather than one you skim.
It moves from the mathematical groundwork a physics degree assumes — single- and multivariable calculus, linear algebra and differential equations — into the physical core: Newtonian mechanics, oscillations and waves, geometric and wave optics, and classical electromagnetism. Dedicated chemistry and computer-science units round out the scientific toolkit, and a laboratory unit covers measurement, uncertainty and experimental method so the theory stays tied to the real world.
It is designed for students starting a physics, engineering or natural-sciences degree, anyone retaking first-year physics, and self-learners who want a rigorous path instead of scattered videos. Every unit is free to start, your progress syncs across devices, and the lesson text is open-source on GitHub.
Every lesson explanation in Physics I is free to read on the web. Practice questions and interactive scenes are in the app.
Yes — you can start Physics I for free on iOS, Android and web. The lesson content is also open-source under a CC BY-SA licence on GitHub, so you can read it anywhere.
Single- and multivariable calculus, linear algebra, differential equations, classical mechanics, oscillations and waves, geometric and wave optics, electromagnetism, plus chemistry, computer science and laboratory practice — the full first-year foundation for a physics or engineering degree.
No formal prerequisites beyond high-school mathematics. The early units build the calculus and linear algebra you need before the physics that uses them, so you can start from the beginning and work up.
Many questions are interactive scenes: instead of picking a letter, you manipulate the diagram — drag a force vector, release a mass, change a field — and your answer is graded from what you did. The visual is the question, not decoration.
It is self-paced across its units of short lessons, each followed by practice questions with instant feedback. You can stop and resume anytime, and your progress is saved across devices.