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(), n. 1. Force; power. 2. (Law) (a) Physical force. (b) Moral power. 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. [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. Vis interti 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, or Vis vitalis [L.] (Physiol.), vital force. Vis viv スポンサード リンク
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