Newton's cradle

== English == === Alternative forms === Newton's Cradle === Etymology === Named after Isaac Newton. === Noun === Newton's cradle (plural Newton's cradles) A device that demonstrates conservation of momentum and energy via a series of swinging spheres. When a sphere at one end is lifted and released, the resulting force travels through the line and pushes the opposite sphere upward, repeating the process as it swings back down. ==== Synonyms ==== Executive Ball Clicker ==== Translations ====