Phyein Usul← Numa Koudsie

Interactive physics · simulations and lecture notes

Simulations.

Each figure is a small laboratory with its lecture note beneath it: the physical picture, the model, the derivation, the numerical method, and every number the picture is drawn from.

Every simulation, the same four parts

Open any figure and you find the same layout, so what you learn on one page carries over to the next.

  1. 01 · Figure

    Change it and watch

    Sliders and clicks set the physics: lengths, frequencies, masses, start conditions, the wind. The picture answers at once, or, where the whole run is solved first, as soon as you press Solve.

  2. 02 · Lecture note

    The physics, written out

    A motivating picture, the model, the derivation, the numerical method, what is on screen and what the model leaves out, with numbered equations, figures and exercises.

  3. 03 · From symbols to code

    The walkthrough

    Each formula next to the line of the page’s own code that computes it, with the live value beside it.

  4. 04 · Data panel

    The numbers

    Every variable the figure draws, with units. Pin a point with Read values, record one round as a table, check a value three ways, save it as .npz or CSV.