vis viva

== English == === Etymology === From Latin, meaning "live force", coined by Gottfried W. Leibniz in order to denote a quantity discovered by Christiaan Huygens. === Noun === vis viva (physics, obsolete) The product of an object's mass and the square of its speed. Antonym: vis mortua ==== Usage notes ==== It is exactly twice what is now called kinetic energy. ==== Derived terms ==== vis viva equation ==== Related terms ==== ==== See also ====