Free Online Physics Simulations

Interactive Physics Simulations for High-School and University Students

A free online physics simulations hub inspired by PhET, with interactive simulations and simple animations for students, teachers, and self-learners.

Wave Phenomena

Doppler Effect Moving source compresses/stretches waves Double Slit Experiment Wave interference creates bright/dark patterns Single-Slit Diffraction Diffraction envelope and fringe spreading through one slit Standing Waves Normal modes and nodes on a string with fixed ends Beats Envelope modulation from superposition of close frequencies Resonance Driven oscillator resonance peak and response amplitude Wave Reflection Fixed/free/partial boundary reflections and transmission Constructive & Destructive Interference Phase-dependent addition of two same-frequency waves Sonic Boom / Mach Cone Wavefronts and Mach cone geometry for supersonic motion Ripple Tank Multi-source wave interference visualization Fourier Synthesis Build complex waveforms by summing harmonics Wave Polarization Linear, circular, and elliptical polarization states Huygens' Principle Secondary wavelets form advancing wavefronts through apertures Chladni Patterns Nodal line patterns on vibrating plates

Classical Mechanics

Newton's Laws of Motion Force, mass, friction, and acceleration in cart dynamics Projectile Motion Launch projectiles with adjustable angle & velocity Inclined Plane Force decomposition and friction on a ramp Friction (Static vs Kinetic) Threshold behavior and motion under static/kinetic friction Newton's Cradle Momentum transfer through a chain of nearly elastic collisions Circular Motion Velocity and centripetal acceleration in uniform circular motion Centripetal Force Radial acceleration and vector relationships in circular motion Coriolis Force Trajectory deflection in a rotating reference frame Center of Mass Weighted average position of a multi-mass system Simple Pendulum Oscillation under gravity with real-time graph Double Pendulum Chaotic motion from a simple system Gyroscope / Precession Precession of a spinning top under gravity Coupled Oscillators Energy transfer and normal-mode behavior in linked oscillators Damped Oscillations Decay of oscillation amplitude with damping strength Forced Oscillations Driven response, resonance, and phase lag Spring-Mass Oscillator Hooke's law with damping Conservation of Momentum Collision outcomes under momentum conservation and restitution Atwood Machine Two masses on a pulley illustrating net-force acceleration Inelastic Collision (1D) Momentum conserved while kinetic energy decreases Elastic Collisions Momentum & energy conservation in 2D Lever & Pulley Mechanical advantage from lever arms and pulley geometry

Gravity & Orbits

Kepler's Orbits Elliptical orbits with changing speed and equal-area sweeps Gravitational Field Field vectors and potential landscape around gravitating masses N-Body Gravity 60+ bodies in gravitational orbit Tidal Forces Differential gravity stretches extended bodies into tidal bulges Lagrange Points Equilibrium points in a rotating two-body system Gravitational Slingshot Gravity assist trajectories gain or lose speed near moving planets Escape Velocity Launch speed threshold for bound and unbound trajectories Hohmann Transfer Two-burn transfer ellipse between circular orbits Gravitational Lensing Mass bends light rays into arcs and ring-like images

Electromagnetism

Electric Field Lines Visualize fields from point charges Magnetic Field Lines Dipole field lines and field-strength regions around a magnet Coulomb's Law Inverse-square electric force between point charges Electromagnetic Wave Propagation Coupled oscillating E and B fields traveling through space Faraday's Law Changing magnetic flux induces an emf in a loop Lenz's Law Induced currents oppose changes in magnetic flux Lorentz Force Charge motion under combined electric and magnetic fields Cyclotron Motion Circular motion of a charged particle in a uniform magnetic field Biot-Savart Law Magnetic field from current elements in a loop Ohm's Law Circuit Voltage, resistance, current, and power in a simple circuit Kirchhoff's Laws Current splitting and loop voltage balance in a branch circuit RC Circuit Capacitor charging/discharging and time constant behavior RLC Circuit / Resonance Driven series RLC response and resonance tuning AC vs DC Time-varying AC compared with steady DC across a load

Optics & Light

Snell's Law (Refraction) Light bending at material boundaries Total Internal Reflection Critical angle and trapped rays at refractive boundaries Thin Lens Simulation Ray tracing and image formation with thin lenses Mirror Reflection (Concave/Convex) Curved-mirror ray diagrams and image properties Prism Light Dispersion White light split by wavelength-dependent refraction Rayleigh Scattering Shorter wavelengths scatter more strongly in the atmosphere Brewster's Angle P-polarized reflection vanishes at a special incidence angle Fresnel Diffraction Near-field diffraction pattern from phase summation Chromatic Aberration Different wavelengths focus at different image distances Thin Film Interference Reflected color varies with film thickness and angle Optical Fiber Light Guide Guiding by total internal reflection in a core-cladding fiber Blackbody Radiation Planck's law & Wien's displacement

Thermodynamics

Ideal Gas Law Particle box and piston illustrating PV = nRT Brownian Motion Random walk from microscopic collisions Heat Conduction Temperature diffusion through a rod Carnot Engine Ideal heat-engine cycle and efficiency limit Entropy Visualization Mixing and multiplicity as a visual entropy proxy Phase Transitions Heating curve with melting and boiling plateaus Bernoulli's Principle Speed-pressure tradeoff in ideal fluid flow Laminar vs Turbulent Flow Ordered flow transitioning toward turbulent mixing Venturi Effect Throat acceleration and pressure drop in a constriction Convection Cells Buoyancy-driven circulation from heated boundaries Thermal Expansion Linear expansion of solids with temperature Archimedes' Principle Buoyancy from displaced fluid weight Maxwell-Boltzmann Gas particle speed distribution

Quantum Mechanics

Uncertainty Principle Position-momentum spread tradeoff in wave packets Quantum Superposition Interference from combining quantum amplitudes Quantum Tunneling Wavefunction penetrating a potential barrier Photoelectric Effect Electron emission from light above a threshold frequency Stern-Gerlach Spin-state beam splitting in a magnetic-field gradient Electron Diffraction Matter-wave interference pattern from electron paths Particle in a Box Discrete standing-wave states in an infinite well Bloch Sphere Qubit state visualization on a Bloch sphere projection Band Gap Valence-conduction bands and energy gap visualization Wave Packet Localized quantum packet propagation and spreading Schrödinger Equation (1D) Wave-packet time evolution in a 1D potential landscape Quantum Harmonic Oscillator Discrete oscillator levels and wavefunctions Aharonov-Bohm Effect Phase-shifted interference from confined magnetic flux de Broglie Wavelength Matter wavelength versus momentum with fringe preview Photon Polarization Polarization state and analyzer transmission Hydrogen-like Atom Toy radial probability and shell scaling with n and Z Quantum Jump Two-level state switching and jump timeline Transmission Coefficient Barrier transmission versus energy and width Probability Current Flow of probability from phase gradients Avoided Crossing Coupling opens a gap where levels would cross Landau-Zener Transition Non-adiabatic transitions through avoided crossings Open Quantum System (Decoherence) Environmental coupling damps quantum coherence Quantum Tomography Reconstruct qubit state from basis measurements Quantum Contextuality Toy context-dependent measurement witness Landau Levels Magnetic-field quantized cyclotron energy levels Fano Resonance Asymmetric resonance from path interference Quantum Heat Engine Toy heat-engine cycle with quantum working system Hydrogen Orbitals Qualitative orbital clouds and nodal structure Compton Scattering Photon wavelength shift after scattering

Relativity

Time Dilation Moving clocks tick slower by the Lorentz factor Length Contraction Moving lengths contract along the motion direction Lorentz Transformation Transform events between inertial frames Twin Paradox Compare proper time on Earth and a relativistic trip Spacetime Diagrams Worldlines and light lines on Minkowski axes Light Cone Visualization Causal structure and spacelike/timelike separation

Chaos & Complex Systems

Lorenz Attractor The butterfly-shaped strange attractor Mandelbrot / Fractal Explorer Interactive Mandelbrot set rendering Cellular Automata Conway's Game of Life and emergent patterns Logistic Map / Bifurcation Diagram Period-doubling route to chaos in a nonlinear map Percolation Simulation Spanning clusters and threshold behavior Flocking / Boids Algorithm Emergent flocking from local motion rules Reaction-Diffusion Patterns Pattern formation from reaction and diffusion Lissajous Figures Parametric curves from orthogonal oscillations Moiré Patterns Large fringes from overlapping line grids

Physics Simulations is built as a multilingual, SEO-friendly hub with locale-specific content, translated slugs, and interactive online simulations across core physics topics.

Next phase: expand theory pages, lesson pages, and curriculum-friendly guides around each simulation while improving translations and scientific fidelity.