Understand physics before the equation.
Every lesson starts with one question. You guess, run the simulation and see why. The formula comes last.
Three balls leave at the same speed. Which angle throws the furthest?
Just guess: no calculation needed.
42
lessons
6
courses
40
simulations you run
Free
no sign-up to start
How a lesson works
The way a good teacher explains physics, with a simulation you control. Try the pieces below.
Every lesson starts with one question
Not a list of definitions. A question you could actually ask, like how far a car needs to stop. New ideas arrive only when the question needs them.
Stopping Distance: Velocity and Acceleration
20 minIf you drive twice as fast, how much further do you need to stop?
Motion Graphs
20 minA sprinter's run is recorded as distance against time. When does she reach top speed, and what is it?
Free Fall and the Equations of Motion
22 minYou drop a stone into a well and hear the splash 2.0 s later. How deep is the well?
You guess before you see
Before each result you make a quick guess by gut feel. There is no calculation and no mark. Being wrong first is part of how the idea sticks.
A bowling ball and a tennis ball are dropped from the same height. Which lands first?
Just guess: wrong guesses help you learn.
Then you run the simulation
The simulation is the diagram. You change one thing, run it, and watch what happens to the numbers.
Car speed
The formula comes last
Only once you have seen why does the maths appear, first in words, then in symbols. Each part of it is something you have already watched happen.
In words
stopping distance = thinking distance + braking distance
In symbols
Each part of the formula is something you have already watched happen.
From GCSE to A-level and beyond
42 lessons in 6 courses, from how things move to how atoms behave.
In this course
- Stopping Distance: Velocity and Acceleration
- Motion Graphs
- Free Fall and the Equations of Motion
- Throwing Straight Up
- Horizontal Launch: Two Independent Directions
- Projectile Motion: the Angle for Maximum Range
- Projectiles from a Height
2 more lessons · 34 coming soon
Mechanics
How things move, why they move, and what stays the same. Each lesson starts from one question: you guess, run the simulation, then see why.
Kinematics is ready. Dynamics and Energies are coming soon.
Lesson 1 · Stopping Distance: Velocity and AccelerationIf you drive twice as fast, how much further do you need to stop?Open the Mechanics courseIn this course
- Wave Properties
- Wave Speed
- Wave Interference
- Diffraction
- Sound Waves
- The Doppler Effect
- Standing Waves & Resonance
1 more lesson
Waves
Ripples, sound and resonance — one set of ideas that describes every wave there is.
Lesson 1 · Wave PropertiesAmplitude, wavelength, frequency — and why they matter.Open the Waves courseIn this course
Thermodynamics
Heat, temperature and gases — what happens when you zoom out to billions of particles.
Lesson 1 · Temperature and HeatWhy metal feels colder than wood at the same temperature.Open the Thermodynamics courseIn this course
- Electric Charge & Coulomb's Law
- Electric Fields
- Electric Current & Ohm's Law
- Series and Parallel Circuits
- Magnetic Fields and Forces
- Electromagnetic Induction
- Capacitors
1 more lesson
Electromagnetism
Charges, circuits and fields — the physics that powers everything you plug in.
Lesson 1 · Electric Charge & Coulomb's LawWhy rubbing a comb on hair makes it attract paper.Open the Electromagnetism courseIn this course
Optics
Light bending, bouncing and focusing — from a straw in a glass to fibre optics.
Lesson 1 · Reflection and RefractionWhy a straw in water looks bent — and how fibre optics work.Open the Optics courseIn this course
Modern Physics
Atoms, quanta and nuclei — where everyday intuition finally runs out.
Lesson 1 · The Atomic ModelWhy atoms only emit specific colours of light — never a rainbow.Open the Modern Physics courseBe first to know about new lessons
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Start with one question
If you drive twice as fast, how much further do you need to stop? Guess first, then find out.
Start the first lesson