All Posts
41 articles & simulations — sorted by newest first
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.
Optics
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.
Waves & Oscillations
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.
Modern Physics
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.
Optics
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.
Electromagnetism
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.
Waves & Oscillations
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.
Mechanics
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.
Electromagnetism
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.
Mechanics
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.
Waves & Oscillations
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.
Mathematics & Statistics
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.
Mechanics
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.
Thermodynamics
24 Feb 2026
Statistics Fundamentals
Interactive exploration of mean, median, mode, distributions, and confidence intervals.
Mathematics & Statistics
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.
Waves & Oscillations
15 Feb 2026
Electric Field
Visualize electric field vectors from point charge configurations.
Electromagnetism
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.
Waves & Oscillations
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.
Statistical Mechanics
1 Feb 2026
Lorenz Attractor
Explore the butterfly effect with this iconic chaotic system.
Chaos
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.
Waves & Oscillations
15 Jan 2026
Projectile Motion Simulator
Interactive projectile motion calculator — adjust launch angle, velocity, and gravity to trace live parabolic trajectories.
Mechanics
1 Jun 2019
Anomalous Expansion of Water
Why water breaks the rules — density decreases below 4°C due to hydrogen bonding.
Thermodynamics
6 Oct 2018
Nobel Prize in Physics 2018
Optical tweezers and chirped pulse amplification — tools that transformed science.
General
16 Aug 2018
Stellar Distances
How astronomers measure cosmic distances — parallax, Cepheids, and Hubble's Law.
Astrophysics
7 May 2018
What is a Mirage?
Inferior mirages, superior mirages, and Fata Morgana — light bending through hot air.
Optics
22 Mar 2018
What is the Triple Point?
The unique state where solid, liquid, and gas coexist in thermodynamic equilibrium.
Thermodynamics
7 Mar 2018
How Does Lightning Occur?
Charge separation in thunderclouds and the physics of lightning and thunder.
Electromagnetism
2 Feb 2018
What is a Lunar Eclipse?
Penumbral, partial, and total eclipses — plus the rare Super Blue Blood Moon.
Astrophysics
26 Jan 2018
How Do Magnets Work?
Ferromagnetism, domains, and why only certain elements are magnetic.
Electromagnetism
12 Jan 2018
How Do 3D Glasses Work?
Polarization, anaglyph filters, and active shutters — the physics of stereoscopic vision.
Optics
3 Jan 2018
What is Graphene?
A single atom thick, stronger than steel, and a better conductor than copper.
General
6 Dec 2017
How Do Solar Cells Work?
Photovoltaic cells, band gaps, and tandem configurations — sunlight to electricity.
Electromagnetism
23 Nov 2017
What Are Shooting Stars?
Meteoroids, meteors, and meteorites — space rocks burning up in Earth's atmosphere.
Astrophysics
11 Nov 2017
Why Redefine Mass?
From a platinum cylinder in Paris to Planck's constant — the new kilogram.
General
30 Oct 2017
What is a P-N Junction?
The fundamental building block of diodes, transistors, solar cells, and LEDs.
Electromagnetism
20 Sept 2017
Classical vs Quantum Computers
Bits vs qubits — superposition, entanglement, and the future of computing.
General
14 Sept 2017
How Did Google Get Its Name?
A googol, a typo, and a nine-year-old — the origin of the world's biggest search engine.
General
3 Sept 2017
Giordano Bruno: A Born Rebel
The monk who argued the universe was infinite — and was burned at the stake for it.
General