Play with the numbers.
Then understand why.
Short lessons built around simulations that run the real equations, from mechanics to modern physics. Free for anyone.
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Lesson 1: Motion in One Dimension
Try it
Land the ball on the flag at 40 m. Change only the angle.
Loading simulation…
Each run leaves a mark on this strip.
How it works
Predict first.
You answer before the simulation runs, so a surprise can change your mind.
The real equations.
Every number on screen matches the one you would get by hand.
One colour per quantity.
Velocity is cyan in every simulation, graph and equation.
- position
- velocity
- acceleration
- force
- contact force
- momentum
- kinetic energy
- potential energy
Nothing is graded.
No account, no score, no tracking. Answers stay in this browser.