13 Free Physics Fundamentals Resources (That Actually Work)

Most people don’t struggle with physics because they’re not smart enough. They struggle because they started with the wrong resource.

Too abstract too soon. Too much maths before the concepts made sense. Or a textbook so dry it killed any curiosity before it had a chance to grow.

But the internet has changed physics education permanently. MIT professors, Nobel laureates, and some of the best science communicators alive have put their best work online — for free. You just need to know where to look and how to sequence it.

That’s what this guide is for.

Before You Get Started— Read This First

Don’t try to use all of these at once. That’s the most common mistake self-learners make.

You open five tabs, save three bookmarks, and end up doing nothing. It feels like progress. It isn’t.

So pick one primary resource based on your level. Use the others to fill gaps, reinforce concepts, or follow whatever sparks genuine curiosity. That’s it.

We’ve organised everything by category — textbooks, university courses, interactive tools, and video lectures — so you can find what fits your learning style quickly and get started.

Free Physics Fundamentals Textbooks Worth Actually Reading

1. The Feynman Lectures: The Greatest Physics Textbook Ever Written

If you’ve spent any time around physics, you’ve heard of Richard Feynman. Nobel laureate. Manhattan Project contributor. And by most accounts, the greatest physics teacher who ever lived.

His three-volume lecture series — delivered at Caltech between 1961 and 1964 — is now freely available at feynmanlectures.caltech.edu. No paywall. No account. Full HTML5 edition with proper equations and diagrams.

Volume I covers mechanics, radiation, and heat. Volume II covers electromagnetism and matter. Volume III covers quantum mechanics. Together, they span the full scope of undergraduate physics in a way no other text quite matches.

A 2013 review in Nature mentions that the lectures as having “simplicity, beauty, unity… presented with enthusiasm and insight.” Feynman builds intuition before equations, starts from first principles, and never loses sight of what physics is actually about.

One honest caveat though: the Feynman Lectures aren’t ideal for absolute beginners. They reward readers who already have some physics exposure. Use them to deepen understanding — not to build it from scratch.

Also read: Which is colder: Minus 40°C or Minus 40°F?

2. OpenStax University Physics: The Best Free Textbook for Structured Learning

Want a proper textbook — one that follows a clear curriculum, includes worked examples, and has practice problems with solutions? OpenStax University Physics is the answer.

Published by Rice University and freely available at openstax.org, it comes in both algebra-based and calculus-based versions. Volume 1 covers mechanics, sound, oscillations, and waves. Volume 2 covers thermodynamics, electricity, and magnetism. Volume 3 covers optics and modern physics.

It’s peer-reviewed, used by hundreds of universities across the US, and downloadable as a PDF. And as OpenStax notes on its AP Physics collection page, there’s also a free AP Physics collection produced through a collaboration between OpenStax and Rice Online Learning.

For high school students and first-year undergraduates, this is the most practical free textbook available. Structured, rigorous, and written to be taught from — not just read.

3. The Quantum Cat Guide: A Roadmap for Self-Learners

Finding good resources is one thing. Knowing how to sequence them is another.

The Quantum Cat (thequantumcat.space) publishes a comprehensive, regularly updated guide to learning physics for free — organised by topic, from basic algebra prerequisites all the way through quantum mechanics, relativity, and astrophysics.

It’s not a textbook or a course. It’s a map. And for self-directed learners who feel overwhelmed by options, a map is exactly what they need first.

The 2026 edition is live now. If you’re figuring out where to start — or what comes next in your learning path — this is the first place we’d send you.

Free University Courses From the World’s Best Institutions

4. MIT OpenCourseWare: Actual MIT Physics, For Free

MIT has published virtually every course it teaches — lecture notes, problem sets, exams, solutions, and video lectures — at ocw.mit.edu/courses/physics.

The two foundational courses every MIT undergraduate takes are 8.01 Classical Mechanics and 8.02 Electricity and Magnetism. Both are fully available. Problem sets with solutions. Exams with solutions. Video lectures. Everything a paying MIT student gets — minus the campus experience.

As MIT OCW’s physics department page outlines, the faculty includes three Nobel Prize winners and 21 members of the National Academy of Sciences. Over 500 physics courses and lectures are available in total.

If you’re serious about building a rigorous physics foundation, MIT OCW is the most valuable free resource in this entire list. It’s not easy — it’s MIT. But it’s real, and it’s free.

5. Yale Open Courses (Professor Shankar): The Most Praised University Physics Course Online

Professor Ramamurti Shankar’s two-semester course at Yale is consistently rated among the best free university physics courses available anywhere online.

Fundamentals of Physics I covers Newtonian mechanics, special relativity, gravitation, thermodynamics, and waves. Fundamentals of Physics II covers electromagnetism, optics, and quantum mechanics. Both are available at oyc.yale.edu/physics — full video lectures, exams, and downloadable course materials included.

What makes Shankar stand out is how he teaches. He builds intuition before formalism. Explains the “why” before the “how.” And uses a dry wit that makes two hours of electromagnetism feel less painful than it sounds.

Class Central’s review of the course consistently places it at the top of general university physics rankings. Shankar also authored two published textbooks based on this course — so the lectures and reading align perfectly if you want both.

You’ll need calculus at minimum. But if you have that, this is one of the best physics learning experiences available online, full stop.

6. NPTEL Physics Courses: IIT-Level Teaching, Free for Everyone

India’s National Programme on Technology Enhanced Learning offers free physics courses taught by professors from the Indian Institutes of Technology — some of the most competitive engineering schools in the world.

Available at nptel.ac.in and on YouTube, the courses cover classical mechanics, electromagnetism, quantum mechanics, thermodynamics, nuclear physics, and atomic and molecular physics. The depth and rigour match top university standards.

For students preparing for JEE, NEET, or other competitive exams, NPTEL is especially useful — the instruction style aligns closely with what these exams actually test. And as NPTEL’s certification page explains, certificate exams are available for a small fee if you want formal recognition of completion.

You don’t need the certificate to benefit though. The lectures alone are worth significant time.

Also read: What X*X*X Is Equal To? Let’s Find Out

7. How Things Work (Coursera — University of Virginia): Physics Through Everyday Objects

Not everyone learns well from equations first. Some people need to see physics doing something before the maths makes any sense.

Professor Louis Bloomfield’s “How Things Work” course does exactly that. It teaches physics through everyday objects — skateboards, balls, bicycles, ramps — and uses them to explain Newton’s laws, inertia, gravity, projectile motion, and acceleration.

Free to audit on Coursera at coursera.org/learn/how-things-work. No prior knowledge required.

If you’ve tried textbook-first approaches and hit a wall, this is the reset you need. Physics was always about the real world. Bloomfield just makes that impossible to ignore.

Interactive Tools That Make Physics Click

8. PhET Simulations: The Best Visual Physics Tool Available

Reading about waves is one thing. Watching a wave respond in real time as you change its frequency, amplitude, and medium — that’s something else entirely.

PhET Interactive Simulations from the University of Colorado Boulder (phet.colorado.edu) lets you do exactly that. Free, browser-based, no download required.

Simulations cover mechanics, electricity, magnetism, waves, thermodynamics, optics, and quantum phenomena. Each one includes measurement instruments — rulers, stopwatches, voltmeters, thermometers — so you can take real measurements as you experiment.

And as PhET’s research page confirms, every simulation has been “extensively tested and evaluated” through student interviews and real classroom use. These aren’t educational toys. They’re research-backed tools that build genuine physical intuition.

If you’re a visual learner who struggles to picture what equations are describing, start here. It changes how the maths reads once you’ve seen the behaviour.

9. The Physics Classroom: The Best Free Resource for High School Students

The Physics Classroom (physicsclassroom.com) is exactly what it sounds like — a free online classroom built specifically for high school physics students and their teachers.

Tutorials are written in plain, clear language. Topics cover kinematics, Newton’s laws, vectors, projectile motion, circular motion, momentum, energy, waves, sound, light, and electricity. Each topic comes with concept checkers, interactive exercises, and multimedia support.

The content is curriculum-aligned — which makes it especially useful when you need explanations that match what you’re actually being tested on.

We’d recommend it as a supplement to classroom teaching. When your teacher’s explanation doesn’t quite land, The Physics Classroom almost always has a clearer version of the same concept ready to go.

10. HyperPhysics: The Physics Reference Tool You’ll Keep Coming Back To

HyperPhysics from Georgia State University (hyperphysics.phy-astr.gsu.edu) works differently from everything else here. It’s not a course or a textbook. It’s a web of interconnected concept maps.

You start from a broad topic — mechanics, say — and click through layers of increasing detail. Each node shows equations, worked examples, and links to related concepts. It’s built to show how physics ideas connect, not just define them in isolation.

Physics professors recommend it consistently as a quick-reference tool. Students use it to check formulas, clarify definitions, and trace relationships between concepts they’ve been studying separately.

It’s not the right place to learn something from scratch. But once you’ve covered a topic through a course or textbook, HyperPhysics is the fastest way to review, cross-check, and deepen it.

Free Video Lectures Worth Watching

11. Khan Academy Physics: The Best Starting Point for Most People

If we had to point one person to one resource and nothing else, Khan Academy would be it — for most beginners, at least.

At khanacademy.org/science/physics, you get free, self-paced video lessons covering the full high school and introductory college physics curriculum. Forces, motion, energy, waves, electricity, magnetism, light — all of it, with built-in practice questions and immediate feedback.

One reviewer on Physics Forums described the videos as “remarkably clear, patient, and useful for even a high school student who knows almost nothing.” That’s accurate. The explanations are careful, never rushed, and assume nothing you haven’t already been taught.

Khan Academy also covers prerequisite maths within the same platform — algebra, trigonometry, and calculus are all there if you need to fill in gaps.

And as Khan Academy’s about page notes, over 135 million learners globally use the platform. That number reflects something real about how well it actually works.

Also read: What is HCOOCH CH2 H2O? Complete Details

12. Walter Lewin’s Lectures: The Most Engaging Physics Teaching Ever Recorded

Walter Lewin taught the three core physics courses at MIT for over 30 years. His lectures on Newtonian Mechanics, Electricity and Magnetism, and Vibrations and Waves were watched by more than 4 million students worldwide.

As The New York Times reported, his lectures were delivered “with the panache of Julia Child bringing French cooking to amateurs.” That’s not an exaggeration. Lewin swings on pendulums to demonstrate conservation of energy.

He charges himself to 300,000 volts for electrostatics. He puts his head in the path of a wrecking ball to prove it can’t swing back higher than it started.

His farewell lecture “For the Love of Physics” has been viewed roughly 15 million times. The full series now lives on his personal YouTube channel at youtube.com/@lecturesbywalterlewin7162.

One thing worth knowing: as MIT reported in 2014, MIT removed Lewin’s lectures from OpenCourseWare following a harassment investigation. The videos remain on his YouTube channel. We’re including this resource because the educational value is genuinely exceptional — but you should have the full picture.

13. The Organic Chemistry Tutor: The Best Resource for Exam Preparation

The name is misleading. This YouTube channel (youtube.com/@TheOrganicChemistryTutor) has one of the most comprehensive free physics problem-solving libraries available anywhere.

Thousands of videos covering mechanics, kinematics, forces, energy, waves, electricity, magnetism, optics, and thermodynamics — all through worked examples, step by step, start to finish.

This is where you go when you understand the concept but can’t execute the problem. It’s most valuable in the weeks before exams, when you need to watch problems solved cleanly and repeatedly until the method sticks.

Clear, methodical, beginner-friendly. It doesn’t replace a course. But as a companion to any of the courses above, it’s genuinely hard to beat.

The Full Resource List:

Resource	Type	Level	Best For
Feynman Lectures	Free Textbook	Intermediate–Advanced	Deep conceptual understanding
OpenStax University Physics	Free Textbook	Beginner–Intermediate	Structured textbook learning
The Quantum Cat Guide	Resource Roadmap	All levels	Mapping your learning path
MIT OpenCourseWare	University Course	Intermediate–Advanced	Rigorous university-level physics
Yale Open Courses (Shankar)	University Course	Intermediate	Comprehensive university physics
NPTEL (IIT Professors)	University Course	Intermediate–Advanced	Competitive exam preparation
How Things Work (Coursera)	Online Course	Beginner	Real-world physics from scratch
Khan Academy	Video + Exercises	Beginner–Intermediate	High school and introductory college
PhET Simulations	Interactive Tool	All levels	Visual and hands-on learning
The Physics Classroom	Tutorial Site	High School	Curriculum-aligned content
HyperPhysics	Reference Tool	Intermediate+	Quick reference, concept mapping
Walter Lewin (YouTube)	Video Lectures	Beginner–Intermediate	Engaging, demonstration-led teaching
Organic Chemistry Tutor	Problem-Solving Videos	Beginner–Intermediate	Exam prep, worked examples

Where to Start Based on Your Level

Most resource lists skip this part. But knowing what to use is only half the problem — knowing where to begin is the other half.

Complete beginner?

Start with Khan Academy for concepts and The Physics Classroom for structure. Use PhET simulations to visualise what you’re learning. Then try How Things Work on Coursera to connect physics to the real world.

In high school?

OpenStax College Physics as your primary textbook. Khan Academy for video explanations when the textbook isn’t landing. The Physics Classroom for curriculum-aligned reinforcement. The Organic Chemistry Tutor when exams get close.

At undergraduate level?

OpenStax University Physics first. Then MIT OCW — especially 8.01 and 8.02. Yale Open Courses for a complementary perspective. NPTEL for additional depth on specific topics. Feynman Lectures when you want to go deeper on things you’ve already covered.

Self-teaching with no fixed path?

Start with The Quantum Cat guide to map the journey. Then follow where it points — using PhET for visualisation, HyperPhysics for reference, and Walter Lewin’s lectures when motivation dips.

One Last Thing Worth Saying

The resources in this list have been used by millions of students — from high schoolers in Nairobi to PhD students at Stanford. They’re world-class. And they’re free.

But the resource is rarely the limiting factor. Consistency is.

Thirty minutes of focused study six days a week will build a stronger physics foundation than a frantic week of resource-hopping before an exam. Physics concepts build on each other — mechanics before electromagnetism, Newton before quantum. Rush the early stages and you pay for it later.

So pick your starting point. Stick with it. Use the others to fill in what you’re missing. And give yourself time to actually understand what you’re studying — not just cover it.

Physics rewards patience in a way few subjects do. The satisfaction of understanding why something works — really understanding it — is worth every bit of the effort.