shafe.dev

Newton force law sim

Energy

How to play with it

Gestures

Action	Mouse	Touch
Fling a mass	Grab, then drag a mass	Drag a mass
See its forces	Click a mass or spring	Tap it
Pan	Drag empty paper, or right-drag	Drag empty paper, or two fingers
Zoom	Scroll wheel	Pinch
Add a mass	Build, click	Build, tap
Throw a new mass	Build, drag from empty paper	Same
Add a spring	Build, drag from mass to mass	Same
Pin or unpin	Pin, click a mass	Pin, tap a mass
Cut springs	Snip, swipe across them	Same

Keys

Space: Play / pause
.: Step 1/60 s · Shift+. one Δt
R: Restart · Shift+R restores the preset
V B P X: Grab, Build, Pin, Snip
1–5: Switch integrator
Ctrl+Z: Undo · Ctrl+Shift+Z redo
[ ]: Previous / next scene
− =: Slower / faster
F: Fit the view
Arrows: Pan
T: Trails on / off
A: Arrows: off, selected, all
G: Ghost twin
N: Select the next mass
Del: Delete the selection
Esc: Close, deselect, back to Grab
\: Show or hide settings
?: This help

About

A browser port of simulation.py, a Python spring–mass simulator built on Newton’s second law, F = ma. As in the original, forces, integrators, collision rules and scenes are separate pieces you can swap. Units are SI; Orbits, Figure-eight, Charges and the Thermal lattice use scaled units (G = kₑ = k_B = 1). Everything runs in your browser.

Source on GitHub ↗ · Back to shafe.dev