PhysicsLab
Every concept here is a live, interactive simulation. Hover a tile to see it move, then open it to play. 25 interactive simulations and counting.
Optics · 14 Jun 2026
Interference and Diffraction of Light: Why Waves Make Patterns
See how light waves interfere and diffract with four interactive simulations — Young's double slit, single-slit diffraction, and diffraction gratings explained.
Waves & Oscillations · 27 May 2026
How Do Filters Work? Low-Pass and High-Pass Filters Explained
Explore how low-pass and high-pass filters work with an interactive simulation — from RC circuits and cutoff frequencies to Butterworth filter design.
Modern Physics · 4 May 2026
How Do Lasers Work?
Lasers amplify light through stimulated emission — explore the quantum mechanics of population inversion, optical cavities, and how the first laser was built in 1960.
Modern Physics · 27 Apr 2026
The Photoelectric Effect
Einstein's Nobel Prize experiment visualised — watch photons eject electrons from a metal plate and discover why frequency beats intensity every time.
Optics · 26 Apr 2026
Lens Formula Visualiser
Interactive ray diagram for the thin lens formula — adjust focal length and object distance to see real and virtual image formation for convex and concave lenses.
Electromagnetism · 25 Apr 2026
Coulomb's Law Calculator
Interactive Coulomb's Law simulator — set charge magnitudes, signs, and separation to compute electrostatic force and visualise the electric field.
Waves & Oscillations · 24 Apr 2026
Wave Speed, Frequency and Wavelength
Interactive wave equation calculator — adjust frequency and wavelength to see how wave speed changes, with live animation and frequency spectrum.
Mechanics · 23 Apr 2026
Kinetic and Potential Energy Visualiser
Watch kinetic and potential energy trade off as a mass descends a ramp — see conservation of energy in action with adjustable mass, height, and friction.
Electromagnetism · 22 Apr 2026
Ohm's Law Calculator
Interactive Ohm's Law calculator — enter any two of voltage, current, or resistance and compute the third, with a live V–I characteristic graph.
Mechanics · 21 Apr 2026
Simple Harmonic Motion Simulator
Visualise displacement, velocity, and acceleration in a spring-mass system. Adjust spring constant, mass, amplitude, and damping — explore the phase portrait.
Mechanics · 20 Apr 2026
Newton's Laws of Motion
Explore all three of Newton's laws interactively — inertia, F = ma, and action-reaction — with live graphs and adjustable parameters.
Waves & Oscillations · 7 Apr 2026
Signal Recovery with FFT
Build a noisy signal from multiple frequencies, then use the Fast Fourier Transform to recover the original — see denoising in action.
Waves & Oscillations · 26 Mar 2026
The Doppler Effect
Why does an ambulance siren drop in pitch as it passes you? Visualise the Doppler effect — wavefront compression ahead of a moving source, rarefaction behind it — with adjustable source speed and interactive spectral shifts.
Mathematics & Statistics · 22 Mar 2026
Mandelbrot Set
Zoom into the Mandelbrot set — the most famous fractal in mathematics. Explore infinite boundary complexity generated by a single recursive formula, and discover how iteration count maps to the vivid colour gradient.
Mechanics · 20 Mar 2026
Coupled Oscillators
Watch energy slosh between two spring-coupled masses and discover normal modes — the symmetric and antisymmetric oscillations that underpin everything from molecular vibrations to phonons in crystals.
Thermodynamics · 1 Mar 2026
Leidenfrost Effect
Why do water droplets levitate and skitter on a very hot pan? Explore the Leidenfrost effect — the vapour cushion that insulates droplets above the Leidenfrost point — with an interactive heat transfer simulation.
Mathematics & Statistics · 24 Feb 2026
Statistics Fundamentals
Interactive exploration of mean, median, mode, distributions, and confidence intervals.
Waves & Oscillations · 20 Feb 2026
Fourier Synthesis
Build complex waveforms from harmonics — stack sine waves to construct square, sawtooth, and triangle waves and see how Fourier series works in real time.
Electromagnetism · 15 Feb 2026
Electric Field
Visualize electric field vectors from point charge configurations.
Waves & Oscillations · 10 Feb 2026
Wave Packets
Explore quantum wave packets — see how superposing plane waves creates a localised particle, and discover Heisenberg's uncertainty principle through the interactive dispersion and group velocity controls.
Statistical Mechanics · 5 Feb 2026
Maxwell Velocity Distribution
Visualize the Maxwell-Boltzmann speed distribution — see how molecular speeds shift with temperature, and compare most probable, mean, and root-mean-square velocities in an interactive simulation.
Chaos · 1 Feb 2026
Lorenz Attractor
Explore the butterfly effect with this iconic chaotic system.
Waves & Oscillations · 20 Jan 2026
Lissajous Figures
Explore Lissajous figures — beautiful parametric curves traced by two perpendicular harmonic oscillators. Adjust frequency ratio and phase to see patterns shift from lines to ellipses to knots.
Mechanics · 15 Jan 2026
Projectile Motion Simulator
Interactive projectile motion calculator — adjust launch angle, velocity, and gravity to trace live parabolic trajectories.
Electromagnetism · 30 Oct 2017
What is a P-N Junction?
The fundamental building block of diodes, transistors, solar cells, and LEDs.