Waves, circuits, forces and the very small — as things you can push on.
5 sites
Build a circuit by dragging components onto a grid and watch charge actually move through the wires, with current shown as animated dots and voltage as colour. The fastest way to stop treating circuit diagrams as abstract symbols.
The rest of Falstad's collection: wave interference, coupled oscillators, Fourier synthesis, gas molecules, vector fields. Small, fast, single-purpose applets with no preamble.
Several hundred sandboxes covering mechanics, waves, circuits, heat and quantum. Every one is built around a slider you can drag until the concept gives in. The most reliable starting point for almost any physics topic.
Focused, one-concept-at-a-time sandboxes with the algebra kept deliberately out of the way. Good when a simulation with forty parameters is more than you need.
