Free · runs in your browser
31 labs
Functions, calculus, conic sections, geometry and probability, each as a board you can drag.
8 chapters
Drag the parameters of a graph and watch it move: a parabola shifted and stretched, exponentials mirrored into logarithms, sine unrolled from the unit circle and reshaped by A, ω and φ, tangents that reveal where a function rises and turns, a zero trapped by halving, and rectangles adding up to an integral.
4 chapters
Each conic from its own definition: a string of fixed length round two pins, equal distances to a focus and a line, a fixed difference of distances. Then one eccentricity ties the three into a single family.
Start the lab4 chapters
Proofs you can take apart by hand: move the pieces and see why the theorem has to hold.
4 chapters
Chance built up from counting: choose and arrange, add up the paths of repeated trials, read probability as area under the bell curve, and watch a frequency settle as the trials pile up.
Motion, forces and waves you can set running and measure.
4 chapters
Straight-line motion on a v–t graph, projectiles, circles and relative velocity: set things moving and read the numbers off the board.
Start the lab4 chapters
Resolve forces on a slope, time a spring and a pendulum, and follow energy as it changes form: every force and every joule drawn on the board.
Start the lab3 chapters
Watch a wave travel while the medium stays put, two waves add into an interference pattern, and a moving source squeeze its own sound.
Start the lab