# Principle of vis viva

Principle of vis viva
Vis Vis, n. 1. Force; power. [1913 Webster]

2. (Law) (a) Physical force. (b) Moral power. [1913 Webster]

{Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that of the retarding forces is equal to one half the vis viva accumulated or lost in the system while the work is being done.

{Vis impressa} [L.] (Mech.), force exerted, as in moving a body, or changing the direction of its motion; impressed force.

{Vis inerti[ae]}. [L.] (a) The resistance of matter, as when a body at rest is set in motion, or a body in motion is brought to rest, or has its motion changed, either in direction or in velocity. (b) Inertness; inactivity.

Note: Vis interti[ae] and inertia are not strictly synonymous. The former implies the resistance itself which is given, while the latter implies merely the property by which it is given.

{Vis mortua} [L.] (Mech.), dead force; force doing no active work, but only producing pressure.

{Vis vit[ae]}, or {Vis vitalis} [L.] (Physiol.), vital force.

{Vis viva} [L.] (Mech.), living force; the force of a body moving against resistance, or doing work, in distinction from vis mortua, or dead force; the kinetic energy of a moving body; the capacity of a moving body to do work by reason of its being in motion. See {Kinetic energy}, in the Note under {Energy}. The term vis viva is not usually understood to include that part of the kinetic energy of the body which is due to the vibrations of its molecules. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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• Vis viva — Vis Vis, n. 1. Force; power. [1913 Webster] 2. (Law) (a) Physical force. (b) Moral power. [1913 Webster] {Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that …   The Collaborative International Dictionary of English

• Vis viva — In the history of science, vis viva (from the Latin for living force ) is an obsolete scientific theory that served as an elementary and limited early formulation of the principle of conservation of energy. It can be thought of as a type of… …   Wikipedia

• Vis-viva equation — Astrodynamics Orbital mechanics Equations …   Wikipedia

• Vis — Vis, n. 1. Force; power. [1913 Webster] 2. (Law) (a) Physical force. (b) Moral power. [1913 Webster] {Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that of… …   The Collaborative International Dictionary of English

• Vis impressa — Vis Vis, n. 1. Force; power. [1913 Webster] 2. (Law) (a) Physical force. (b) Moral power. [1913 Webster] {Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that …   The Collaborative International Dictionary of English

• Vis inertiae — Vis Vis, n. 1. Force; power. [1913 Webster] 2. (Law) (a) Physical force. (b) Moral power. [1913 Webster] {Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that …   The Collaborative International Dictionary of English

• Vis mortua — Vis Vis, n. 1. Force; power. [1913 Webster] 2. (Law) (a) Physical force. (b) Moral power. [1913 Webster] {Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that …   The Collaborative International Dictionary of English

• Vis vitae — Vis Vis, n. 1. Force; power. [1913 Webster] 2. (Law) (a) Physical force. (b) Moral power. [1913 Webster] {Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that …   The Collaborative International Dictionary of English

• Vis vitalis — Vis Vis, n. 1. Force; power. [1913 Webster] 2. (Law) (a) Physical force. (b) Moral power. [1913 Webster] {Principle of vis viva} (Mech.), the principle that the difference between the aggregate work of the accelerating forces of a system and that …   The Collaborative International Dictionary of English

• Principle of least action — This article discusses the history of the principle of least action. For the application, please refer to action (physics). In physics, the principle of least action or more accurately principle of stationary action is a variational principle… …   Wikipedia