Your physics journey
starts in 10 seconds.
Start with one simulation. Stick around because it actually makes sense.
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For Cambridge IGCSE, GCSE, AP Physics 1, NGSS and more
Physics taught with three of the best-proven methods in learning science. Free to begin for every student, teacher and curious mind.
Every lesson starts with a question: what happens if you double the mass? You predict, run the simulation and see if you were right. By the time F = ma appears, it describes something you have already watched happen — so in the exam you can picture the problem, not just remember a line.
Most lessons take about five minutes, so one fits between homework, on the bus or before bed. Your progress is saved to your account, on your phone and your laptop, and Learn always has your next lesson ready.
Quiz questions are written like the ones on your exam, and every answer, right or wrong, comes back with the full worked solution set out the way an examiner expects. You find out why, not just whether, you were wrong.
Every lesson, simulation and unit quiz is free with an account: no card, no time limit and no ads. Physi+ adds extra exam practice for when your exam gets close, but you never need it to learn the course.
For anyone curious about physics, students and teachers included
“The interactive explanations make things much easier to visualise.”
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“Some physics topics are difficult to imagine, but seeing them visually helps everything click.”
“The visual elements make learning more enjoyable.”
“Visual learning is incredibly important in physics.”
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“Being able to change variables and immediately see what happens makes physics feel much less abstract.”
“Really useful for revising difficult topics.”
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“A great supplementary resource for physics.”
“Sometimes seeing the same concept presented differently is all it takes.”
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“I like the idea of a platform that combines clear explanations with interactive ways to explore science.”
Your syllabus the way your exam board writes it: every point, the lesson that teaches it, the quiz that proves it, and your mastery on each. The maps are public, so open yours before you sign up.
All questions are original. Physiworld is not affiliated with Cambridge Assessment, AQA, Pearson Edexcel, OCR, the College Board or Achieve, Inc. AP® is a trademark of the College Board; NGSS® of Achieve, Inc.
Ask anything in physics. Every answer follows the same three moves, and the last one is always yours.
If gravity pulls everything at the same rate, why does a feather fall slower than a hammer?
Gravity gives both the same acceleration. The difference is air resistance: the feather has a lot of surface for very little weight, so drag soon balances it. On the Moon, with no air, they land together.
Try this: a 2 kg ball falls and feels 5 N of drag. What is its acceleration?
Weight is 2 × 9.8 = 19.6 N. 19.6 − 5 = 14.6 N, so a = 14.6 ÷ 2 = 7.3 m/s².
That’s it: resultant force first, then F = ma. As the ball speeds up the drag grows, so what happens to its acceleration?
Exam-style problems that make you use a whole topic, not one formula. Each one has a worked solution, and most come in more versions to practise: the same problem with new numbers.
Dynamics · Kinematics · equations of motion
A ball is dropped from rest from a 20 m cliff. How long does it take to reach the ground, and how fast is it moving when it does?
Every lesson, simulation and unit quiz is free. Physi+ adds the exam practice: mock exams, theory papers, and Kelvin marking your written answers.
Secure checkout with Stripe 14-day refund policy on every plan No lock-in
Type a calculation and press enter — the free calculator solves it with full step-by-step working. No sign-up required.
Every class has its own six-character code. Students use it once; from then on their lessons and quizzes count for your class.
Name it on your Profile or in the teacher console. You get the class code and a join link.
Write it on the board: they tap Join with code on their Profile and type it in. Or send the link, which joins them on its own.
A new student first makes a free account, with Google or an email. You only ever see the username they chose.
How the teacher console works, step by step. Students join your class once with a code; after that, the lessons and quizzes they already do fill the console in. Built for IGCSE, GCSE, AP Physics and NGSS.
Free for every teacher: creating classes, the join code and teacher view on the projector. Class mastery, assignment results, live lessons and reports come with a school licence: one per school and school year, priced per school, with a 14-day trial.
Rolling out class codes across a department or want a walkthrough? Email us — we’ll help you set it up.
Physiworld is a place to learn physics with people you know: your class, your friends, and everyone else working through the same problems. No public rankings, just a goal you reach together.
Orbit is this week’s goal. Every lesson, quiz and challenge anyone finishes lifts the rocket.
Resets MondayFind your part: for your exam, or for your class.
What it is and what it costs
No background needed, whatever your course
IGCSE, GCSE, AP Physics 1, NGSS — or any other course
Classes, codes and what you can see
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