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 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.

Look at other dictionaries:

  • vis impressa — The original force employed in the commission of a tort or injury done with force. If the proximate cause of the injury is but a continuation of the original force, or vis impressa, the effect is immediate, and the appropriate remedy is trespass… …   Ballentine's law dictionary

  • vis impressa — /vis impresa/ The original act of force out of which an injury arises, as distinguished from vis proximа, the proximate force, or immediate cause of the injury …   Black's law dictionary

  • 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 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

  • 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 proximа — /vis proksama/ Immediate force. See vis impressa …   Black's law dictionary

  • vis proxima — Same as vis impressa …   Ballentine's law dictionary

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