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Conservation of Momentum Classical mechanics

Discover why total momentum never changes in a collision. Adjust mass, velocity, and collision type, then watch momentum bars prove conservation in real time. Includes a challenge mode!

Conservation of Angular Momentum Classical mechanics

See how a spinning platform speeds up when you pull weights inward. Drag weights to change the moment of inertia and watch angular velocity respond — proving angular momentum is always conserved. Includes a challenge mode!

Planet Cannon Classical mechanics

Fire a cannonball on the Moon, Mercury, Venus, Earth, or Mars and discover how gravity shapes the path. Drag the launch vector, adjust mass, and see why heavier cannonballs follow the same arc in a vacuum. Includes a Hit the Target game mode!

Piano Scale Pattern Generator Music

Visual generator for piano scale patterns. Pick a root note and scale type to see the notes laid out on a keyboard diagram.

Gravitational Lens Simulator Astrophysics

See how massive objects like black holes and stars bend light from distant stars. Drag the source to discover Einstein rings, arcs, and multiple images.

Gravity Assist Simulator Astrophysics

See how spacecraft use a planet’s gravity and motion to speed up or slow down without fuel. Toggle between reference frames to discover how the slingshot maneuver really works.

Hohmann Transfer Game Astrophysics

Time your launch and burns to transfer between neighboring planets on a minimum-energy Hohmann orbit. Wait for the right planetary alignment, hold the engine for departure, coast through space, then burn again to capture orbit at the destination.

Flip and Burn Transfer Game Astrophysics

Command an Epstein drive ship on a straight-line transfer between planets. Accelerate, then choose the perfect moment to flip 180° and brake. Flip too early and you stop short; flip too late and the crew doesn’t survive the deceleration.

Time Dilation Simulator Astrophysics

A twin on Earth, a twin in a rocket — who ages less? Pick a real star, set the speed as a fraction of light, and watch two clocks tick at different rates as the Lorentz factor stretches time.

Gravitational Route Time Dilation Astrophysics

Fly two spacecraft from Earth to a real star along different routes past black holes. Bend each path to see how flying deeper through strong gravity makes a pilot age less. Compare onboard clocks at arrival to discover gravitational time dilation.

Copernican Reference Frame Simulator Astrophysics

Switch the center of the Solar System between the Sun, Mercury, Venus, Earth, and Mars. See how Copernicus’s heliocentric model turns complex retrograde loops into clean elliptical orbits.

Wave Interference Quantum physics

Discover how waves add up, cancel out, and create interference patterns. A step-by-step introduction to constructive and destructive interference — the foundation for understanding quantum experiments.

Double-Slit Experiment Quantum physics

Fire single photons at a barrier with slits and watch an interference pattern build up one dot at a time. Switch between one and two slits to see the difference.

Mach-Zehnder Interferometer Quantum physics

Fire single photons through a beam-splitter setup and watch quantum interference in action. Adjust the phase shift, block paths, and see how detection statistics reveal wave-particle duality.

Logic Gate Trainer Computer Science

Interactive tool for learning how logic gates work — AND, OR, NOT, XOR, and more. Build circuits and see how inputs flow through gates to produce outputs.

Morse Code Practice Sheets Communications

Printable A4 practice sheets for two kids learning Morse code. One child reads a randomized list of 26 letters and transmits each one in Morse; the other writes down what they decode. Cut the page in half, hand out, and compare.