Mathematics and physics you can see.
Interactive lessons, study guides and workbooks by Zaid Berjis. Every idea comes with a visualization you can change and explore.
A square wave from sine waves
What you will find here
Three kinds of material, written for students who want to understand the idea, not only the answer.
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Browse lessons
Interactive lessons
Self-study lessons in mathematics, physics and SAT Math, each built around simulations you can change, worked examples that open one step at a time, and questions that check your answers. Free to use on this site.
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About the guides
Study guides
Nonfiction guides that explain one topic from the ground up, published on Amazon Kindle. Coming soon: AP Calculus Complete Course.
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About the workbooks
Workbooks
Practice problems with worked solutions, plus study journals and planners for organizing revision.
Choose a subject
Work through a subject in order, or jump to the lesson you need. Your progress is saved in your browser.
- Mathematics Functions, series and the ideas behind them, each one shown on a graph you can change. 1 lesson
- Physics Forces, energy and momentum, with simulations you can run and change. 18 lessons
- SAT SAT Math skills, one question type at a time, with practice in the style of the test. 1 lesson
- AP Calculus AB/BC Limits, derivatives and integrals for the AB and BC exams. Coming soon
New lessons
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Physics
What a force is, and how to draw one
The first lesson of a full self-study course in mechanics.
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Physics
Elastic and inelastic collisions
Run collisions and watch what happens to momentum and energy.
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SAT
Exponential models
Growth factors, percent change and the traps the SAT sets.
New lessons and books by email
One short email when a new lesson or book is released. No other mail.
Opens your email app with a short message to info@zaidberjis.com.