Frequently Asked Questions
What the lecture series and the problem library are, who they are for, and how to use them, for students, teachers and schools.
What is this?
A free, complete undergraduate physics curriculum: 30-minute video lectures with full derivations, paired with a library of problems worked in full. The two are cross-linked, so every lecture ends with problems to practice and every problem names the lecture that teaches it. A new lecture is published every week.
Who is it for?
Students who want the real thing, from honors high-school physics to olympiad preparation: AP Physics C, IIT JEE Advanced, and first- and second-year undergraduates. Nothing is dumbed down and nothing is skipped. If you can handle calculus, you can start at Lecture 1.
What is different about it?
Rigor, and the production to carry it. Every result is derived on screen rather than quoted, and the animations exist to make the argument visible, not to decorate it. Each lecture is 4K video with accurate English captions and a high-resolution PDF of its slides. Each problem is restated in plain language and solved in numbered steps that reveal one at a time, with the reasoning behind every move, a check of units and limiting cases, and a closing insight. Problems carry two ratings, difficulty and uniqueness, and are tagged by method, so a student can find exactly the kind of practice they need.
What does the curriculum cover?
About 200 lectures and 2,000 solved problems are planned across undergraduate physics. Classical Mechanics is in progress, in two parts on one page: Part I, 17 lectures from statics through Newton’s laws, oscillations, energy and momentum to orbits and Kepler’s laws; then Classical Mechanics II, 15 lectures on least action, rotation, and special and general relativity. The Grammar of Nature, 24 lectures on the mathematics physics is written in, is in production. Electromagnetism follows, then optics, thermodynamics and statistical mechanics, and quantum mechanics.
Which textbooks does it follow?
None. The lectures are original, written and animated by the author. The problem library works I. E. Irodov’s Problems in General Physics, with every restatement, solution and figure original. Standard texts such as Morin for mechanics and Griffiths for electromagnetism make good companions.
Is it free?
Yes, free forever, with no signup and no paywall. The lectures and slides are released under Creative Commons BY 4.0: teachers may show them in class, put them in a syllabus, or build on them, with attribution to the Sinha Foundation.
Who teaches it?
Amit Sinha, who holds a Ph.D. in Electrical Engineering and Computer Science from MIT and a B.Tech. from IIT Delhi, where he received the President’s Gold Medal. The lectures come from a lifelong love of physics. They are produced by the Amit & Deepali Sinha Foundation, which also endows fellowships and faculty chairs at IIT Delhi and MIT.
How should a student use it?
Watch the lectures in order; each one builds on the last and ends with a set of problems from the library. Students who already know a topic can start at any arc and use the problem library on its own, filtering by section, method or rating. Teachers can assign lectures as flipped-classroom viewing and hand out the slide PDFs as reference.
How do I get in touch?
Questions, corrections and requests from schools are welcome through the contact page. If you spot an error in a derivation or a solution, say which lecture or problem number; it will be fixed and credited.