Learn physics with free interactive courses
Pick a section and start solving in your browser. Mechanics first: forces, motion, energy, momentum and gravitation, short lessons, every step of each problem checked, and progress tracked lesson by lesson. No install, no signup wall.
Courses
Each course is a journey: its sections in the order a teacher would teach them, every problem solved in steps with each step checked.
Browse all physics courses
Every course is solved in steps that are checked as you go. Start with mechanics: forces, motion, energy and gravity.
Learn by Solving
Solve every problem the way physicists do: choose your axes, draw the forces, write the equations with units, and the board checks each step.
Draw every force on the body, pick your axes, then write Newton's second law along them.
Build Your Physics Streak
Stay consistent and watch your progress grow! Track your daily physics habit, protect your streak with freeze days, and earn rewards for showing up every day.
12 days streak
Return tomorrow to keep your streak!
January 2026
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Double or Nothing
Day 5 of 7
Streak Freeze
2 left
You're Not Alone
Compete on global leaderboards, invite friends to earn rewards, and celebrate each other's wins. Physics is better with friends!
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Promotion zoneEvery way to learn
Read, listen, test yourself, ask the AI about your own steps, or look up anything you've already covered. Every lesson meets you where you are.
A scalar is a size only, like a mass of 3 kg or a time of 4 s. A vector has a size and a direction.
A force is a push or a pull, measured in newtons: a push of 50 N to the right is a vector.
A vector is drawn as an arrow. Its length shows the size, and the arrow points in its direction.
Earn a Certificate
Earn a certificate when you complete a section. Add it to your LinkedIn profile to show how far your physics has come.
Certificate of Completion
Physics Mechanics
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