Interactives

Open the shared ripple tank for two-dimensional wave interference.

Shape harmonics, play notes, and inspect waveform and spectrogram views.

Probe firelight, embers, moonlight, stars, neon, and fireflies with an in-scene spectrometer.

Open the shared N-body gravity sandbox.

Explore the Earth-Moon-Sun system in 3D, advance time, and walk on Earth or the Moon.

Drag the Moon around its orbit in a top-down Sun-Earth-Moon view and watch the lit fraction and phase name change.

Fly through a Sun-centered 3D solar system, advance time, and land on solid worlds.

Open each of Kepler's three laws to see its description and a matching interactive: stretch an ellipse, sweep equal areas, and link orbital period to size.

Hop a bunny along a number line to meet vectors as one-dimensional hops that add up.

Drag a vector on a grid and read its components, magnitude, and direction.

Hop a bunny head-to-tail along two vectors in either order to see they sum to the same resultant.

Chain head-to-tail hop vectors to guide a bunny around hedges to the carrot.

Slide a scalar to stretch, shrink, and flip a vector, watching negation reverse its direction.

Steer a bunny with arrow keys or WASD, adding one unit vector per hop, to munch carrots that respawn around the field.

Slide an object against a ruler and watch the honest reading become a mark give-or-take half a division — finer marks, smaller doubt.

Combine two measurements and read the uncertainty off the bracket of plausible results, then check it against the add/multiply shortcut rules.

Measure π from round objects and test whether each error bar catches the true value — the error-bar overlap test for comparing experiment to theory.

Click through the seven SI base units to compare their modern constant-based definitions with everyday scales.

Click metric prefixes to see their powers of ten applied across common SI units and derived units.

Move a coefficient and exponent to see how scientific notation becomes ordinary decimal notation.

Watch a pixel-art hedgehog act out the motion the kinematics graphs describe, and scrub through it a moment at a time.

Extract position and time data from your own video, then plot and fit it to measure velocity and acceleration.

Connect position, velocity, and acceleration with graph-driven one-dimensional motion.

Read average and instantaneous acceleration from a velocity graph, and the change in velocity from the shaded area under a(t).

Cut a velocity graph into constant-velocity strips and watch the sum of their signed areas close on the displacement.

Use acceleration controls to stop inside target zones.

Break projectile motion into horizontal and vertical components.

Aim, launch, and compare two-dimensional projectile trajectories.

Explore how acceleration vectors shape two-dimensional motion.

Explore spring, normal, tension, gravity, friction, and net force diagrams with Newt the physics frog.

Watch elastic collisions as a moving backdrop for momentum and kinetic-energy conservation.

See kinetic energy transform while momentum remains conserved.

Compare elastic and inelastic collisions with adjustable cart masses and speeds.

Drag a ball to a height and let it fall, watching gravitational potential energy convert into kinetic energy on a stacked energy bar chart.

Build a 3D roller coaster, release the train, and read speed, g-forces, and the kinetic/potential energy ledger live.

Adjust relative motion and read events, worldlines, and light cones.

Compare a local gravitational field with an accelerating elevator scene.

Trace shortest paths on curved surfaces to build intuition for geodesics.

Drag quiet pendulums behind the text while reading about period and frequency.

Open equation plots and see how amplitude, frequency, and phase reshape motion.

Tune amplitude, mass, stiffness, and damping while tracking energy exchange.

Sweep a driving frequency and watch amplitude and phase respond inline.

Drive coupled oscillators and compare normal-mode responses.

A full-width water-wave field embedded around the introduction to wave motion.

Compare transverse and longitudinal medium motion side by side.

Adjust amplitude, wavelength, and frequency for traveling waves.

Add traveling pulses point by point to see reinforcement and cancellation.

Switch string and pipe boundaries to compare reflected waves.

Compare nodes, antinodes, strings, and air-column harmonics.

Tune light frequency and intensity in an inline photon-emission scene.

Build an interference pattern from single-particle detections.

Sample measurement hits from a localized quantum wave packet.

Compare bound-state potentials and the discrete energies they permit.

Watch a free Gaussian wave packet move and spread from momentum uncertainty.

Evolve a one-dimensional packet as it reflects, transmits, and tunnels through a barrier.

Run a split-step Schrodinger simulator with slit, barrier, and free-packet presets.

Drag a probe around a point charge to read the r̂ unit vector and the field it sets up.

Combine the fields of two point charges and find where the net field vanishes.

Place charges, choose monopole, dipole, or charged-row presets, draw field lines, and launch a test charge.

Tilt a flat surface and change its area to explore the magnitude and sign of electric flux.

Inspect individual faces of a box in a uniform field and see inward and outward flux cancel.

Move charges inside and outside 3D Gaussian surfaces and compare enclosed charge with total flux.

Roll a mass on a 1D potential energy curve for a spring or gravity, tracking the energy exchange.

Tilt a 3D landscape into a top-down map and follow contours at equal 100-meter elevation intervals.

Visualize the electric potential V(x,y) of a point charge as a color map with equipotential contours.

Combine the potential color map, equipotentials, field arrows, and a test charge for any charge configuration.

Drag to apply a field and watch conduction electrons drift through the lattice against their random thermal motion.

Play the relaxation that charges a conducting block’s faces and drives the field inside it to zero.

Throw a switch and watch surface charge spread around the loop, moving the potential drop between the switch gap and the resistor.

Drag resistors, batteries, capacitors, inductors, and switches onto a grid, wire them up, and run a transient simulation with a live scope.

Switch between the star frame and the spinning ship frame and drop a ball to feel centrifugal and Coriolis effects.

Adjust radius and angular speed while tangent velocity and inward acceleration vectors follow an object in circular motion.

Follow two markers at different radii on a spinning or rolling wheel — same ω, different v = rω — with velocity vectors and a cycloid trace.

Give a wheel a constant angular acceleration and scrub time to read θ(t) and ω(t) as rotational analogs of the linear kinematics graphs.

Slide a force along a wrench and tilt its angle to see the lever arm r sin θ and the torque it produces.

Slide point masses along a rod, apply the same torque to two configurations, and compare their angular accelerations.

Race a hoop, disk, solid sphere, and hollow sphere down an adjustable incline with a live energy-bar split between translation and rotation.

Pull a spinning skater’s arms in and out to trade moment of inertia for angular speed while angular momentum stays fixed.

Drop a stationary disk onto a spinning one — the rotational analog of a perfectly inelastic collision, conserving L but not kinetic energy.