Physics Quiz Challenge
Test your physics knowledge across six topics with 60 original questions, instant explanations, progress tracking, and a score to beat.
Core concepts
The laws that run our universe, each with a diagram that shows what the words mean.
Classical Mechanics
Newton's Second Law of Motion
Newton's second law is the workhorse of mechanics: it connects the force on an object to how its motion changes. It explains why a small push can send a…
Kinematics
Projectile Motion Basics
Throw a ball and it follows a graceful curved path called a parabola. That curve is really two simple motions happening at once: steady motion sideways and…
Electromagnetism
Ohm's Law and Electric Circuits
Ohm's law is the starting point for almost all circuit analysis. It links the voltage across a component, the current through it, and its resistance in one…
Thermodynamics
The Ideal Gas Law
The ideal gas law links the four quantities that describe a gas: pressure, volume, temperature and amount. It is one of the most useful equations in…
Waves & Optics
Waves: Amplitude, Frequency and Wavelength
A wave is a travelling disturbance that carries energy without carrying matter. From ripples on a pond to radio signals, waves are described by the same few…
Modern Physics
The Bohr Model of the Atom
The Bohr model pictures electrons in fixed orbits around the nucleus, each with a definite energy. It explains why hydrogen emits light only at certain…
Why PhysicsLab
More than a website, a complete learning environment where physics becomes intuitive through interaction, not memorisation.
Complete curriculum
Forty original articles, from Newton’s laws to quantum computing, each with the working shown, not just the answer.
Interactive simulations
Six games and simulators. Change a number and watch what happens: intuition first, formulas second.
Calculators that show the working
Fifty calculators. Every answer comes with the substitution and the steps, not just a number.
Intuition before mathematics
Every topic starts with the physical idea, the why, before the maths.
Visual explanations
Labelled diagrams on the articles that need them. A picture that earns its place, never decoration.
Free and open
Free forever. No account, no paywall, no login. Your settings stay in your own browser.
Start with a branch
Six branches of physics. Every branch has articles, calculators and a cheat sheet.
Articles worth reading first
Original articles with the working shown, not just the answer.
Calculators
Fifty calculators that show the working, step by step.
| Calculator | Formula | Branch |
|---|---|---|
| Banked Curve Calculator | tan θ = v² ÷ (r × g) | Classical Mechanics |
| Buoyancy Calculator | F_b = ρ × V × g | Classical Mechanics |
| Centripetal Force Calculator | F_c = m × v² ÷ r | Classical Mechanics |
| Circular Motion Calculator | a = v² ÷ r | Classical Mechanics |
| Escape Velocity Calculator | v = √(2 × G × M ÷ r) | Classical Mechanics |
| Gravitational Field Calculator | g = G × M ÷ r² | Classical Mechanics |
| Gravitational Potential Energy Calculator | PE = m × g × h | Classical Mechanics |
| Hooke's Law Calculator | F = k × x | Classical Mechanics |
| Impulse and Momentum Calculator | J = F × Δt = Δp | Classical Mechanics |
| Kinetic Energy Calculator | KE = ½ × m × v² | Classical Mechanics |
Games
Six interactive games. Learn by doing, not by reading.
Projectile Motion Simulator
Launch a projectile, adjust angle and speed, watch the trajectory unfold, and try to hit the target flag downrange in this simulator.
Pendulum Simulator
Swing a pendulum on Earth, the Moon or Jupiter. Change the string length and gravity and watch the period change live as it swings.
Wave Interference Visualiser
Two wave sources, one pattern: explore constructive and destructive interference and reveal the nodal lines in this animated visualiser.
Circuit Builder
Build a series or parallel circuit with up to three resistors and see resistance, current, voltage and power update live.
Physics Unit Converter
Convert length, mass, time, energy, temperature and speed instantly, with the exact factors physicists use for homework and lab work.
Cheat sheets
Every key formula for a branch, on one page.
| Branch | Formulas | About |
|---|---|---|
| Classical Mechanics | 34 | Forces, energy, momentum and motion. |
| Kinematics | 22 | Describing motion: velocity, acceleration and trajectories. |
| Electromagnetism | 29 | Charge, current, fields, circuits and magnetism. |
| Thermodynamics | 19 | Heat, temperature, energy and entropy. |
| Waves & Optics | 25 | Waves, sound, light, lenses and interference. |
| Modern Physics | 27 | Quantum mechanics, relativity, atoms and beyond. |