Try Notedeck free · More Special Relativity demos
← Notedeck 狭义相对论 · Relativistic velocity addition · u′ = (u+v)/(1+uv/c²) Try in Notedeck

Relativistic velocity addition · u′ = (u+v)/(1+uv/c²) — interactive Special Relativity demo

Two speeds combine below c — never the naive sum, exactly

Run this interactive Special Relativity demo live below, or download it as a single self-contained HTML file that works offline in any browser or LMS — one of 1,900+ free interactive teaching demos on Notedeck. With Notedeck you upload your own materials and turn them into interactive courseware, question papers with answer keys, and AI-taught lessons.