Your physics journey
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Join close to 2,000 learners. Start with one simulation. Stick around because it actually makes sense.
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Understand how the universe actually works — by running it yourself. Free, no physics background needed, and close to 2,000 people have already started here.
You do not read about a law here, you run it. Change the mass, the force, the temperature, and watch what that does — then the formula arrives as the shorthand for something you have already seen happen.
Every mission asks you to predict before it lets you run anything. Getting it wrong is the part that teaches, so each answer comes back with the full working — not a score, an explanation.
The thing you got wrong comes back — days later, when you have almost forgotten it, which is exactly when remembering it makes it stick. You do not have to plan any of that. And when a question still makes no sense the second time, Kelvin, the built-in AI tutor, will take it apart with you.
One new problem every day, and a leaderboard of people working through the same one. It is there because coming back tomorrow is what turns an afternoon of curiosity into actually knowing physics.
For students, teachers, and anyone curious about physics
"Something like Duolingo but with physics. It was boring for me in high school — this actually got me interested."
"I’ve always hated learning physics, but this actually makes it easier — kind of fun, even."
"Genuinely impressed with how engaging it is and how simple it was to pick up. Definitely using it again."
"Feels way more put-together than I expected. I’m not even into science and I still learned something in the first few clicks."
"A genuinely good way to teach physics — wish something like this existed when I was in school."
"A bit like Brilliant, but more specific about physics. Feels just like the lab simulations from my physics labs."
"I was skeptical of anything game-like, but my son actually asks to practice now — that never happened with his old worksheets."
"I dropped physics at sixteen and always regretted it. I do a mission on the train home now. There’s no exam at the end — I just wanted to finally understand the thing."
"The simulations are pretty fun — solid for a free physics site."
"I hadn’t touched science since school and assumed that ship had sailed. Started with why ships float, actually, and then just kept going."
"Quick, simple problems that help me step up to the harder ones my professor gives out."
"Didn’t expect an interactive tool to make physics feel this engaging. Using it for my studies now."
"I opened it to help with her homework. Three weeks later I’m two topics ahead of her and she’s not pleased about it."
"I tutor a few students after school and started pointing them here for extra practice — saves me writing worksheets."
"I watched a documentary about black holes and got annoyed that I couldn’t follow it. You can find yourself just browsing away here — there’s a lot to go through."
"I haven’t seen many interactive physics websites. Pretty cool concept."
"Saved it for my A-level physics revision."
"I’ve wired houses for eleven years and never properly understood why any of it works. The circuit simulation cleared up something I’d been fudging the whole time."
"Love it. Keep up the good work."
This is the part for the exam. Pick your syllabus and every section is mapped to the lesson that teaches it and the quiz that proves it — tagged Core or Supplement where your board does that, with a worked solution on every answer and your missed questions scheduled to come back.
Understand each idea before you memorise a formula.
Tagged Core & Supplement, marked the instant you answer.
A real-world scenario, backed by stats on common mistakes.
Original questions aligned to the Cambridge IGCSE (0625) syllabus, and useful practice for GCSE, AP Physics 1 and NGSS-aligned courses. Physiworld is not affiliated with, endorsed by, or involved with Cambridge Assessment, the College Board or Achieve, Inc. AP® is a trademark of the College Board; NGSS® of Achieve, Inc.
Every simulation you run, every quiz you complete — it all counts toward a shared goal. Add friends to compare XP head-to-head, or create a free class so your whole group can climb the same leaderboard.
Sign in to see your rank and contribute to this week's goal!
Type a calculation and press enter — the free calculator solves it with full step-by-step working. No sign-up required.
Create a class, share one code, and your students land on a private weekly leaderboard. Built for IGCSE, GCSE, AP Physics and NGSS.
Rolling out class codes across a department or want a walkthrough? Email us — we’ll help you set it up.
Real exam-style problems to crack. Solve them for XP and climb the leaderboard.
Dynamics · Kinematics · equations of motion
For the curious and the examined alike.
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