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Dictionary Meaning and Definition on 'Inertia'

Inertia Meaning and Definition from WordNet (r) 2.0
    inertia n
  1. a disposition to remain inactive or inert; "he had to overcome his inertia and get back to work" [syn: inactiveness, inactivity] [ant: activeness]
  2. (physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force
Inertia Meaning and Definition from Webster's Revised Unabridged Dictionary (1913)
    Inertia \In*er"ti*a\, n. [L., idleness, fr. iners idle. See Inert.]
  1. (Physics) That property of matter by which it tends when at rest to remain so, and when in motion to continue in motion, and in the same straight line or direction, unless acted on by some external force; -- sometimes called vis inerti[ae]}.
  2. Inertness; indisposition to motion, exertion, or action; want of energy; sluggishness. Men . . . have immense irresolution and inertia. --Carlyle.
  3. (Med.) Want of activity; sluggishness; -- said especially of the uterus, when, in labor, its contractions have nearly or wholly ceased. Center of inertia. (Mech.) See under Center.
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Wikipedia Meaning and Definition on 'Inertia'

Inertia is the resistance of any physical object to a change in its state of motion or rest. It is represented numerically by an object's mass. The principle of inertia is one of the fundamental principles of classical physics which are used to describe the motion of matter and how it is affected by applied forces. Inertia comes from the Latin word, "iners", meaning idle, or lazy. Sir Isaac Newton defined inertia in Definition 3 of his PhilosophiƦ Naturalis Principia Mathematica, which states:

In common usage, however, people may also use the term "inertia" to refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its momentum, depending on the context (e.g. "this object has a lot of inertia"). The term "inertia" is more properly understood as shorthand for "the principle of inertia" as described by Newton in his First Law of Motion. This law, expressed simply, says that an object that is not subject to any net external force moves at a constant velocity. In even simpler terms, inertia means that an object will always continue moving at its current speed and in its current direction until some force causes its speed or direction to change. This would include an object that is not in motion (velocity = zero), which will remain at rest until some force causes it to move.

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'Inertia' in famous quotation sentence

* All that is necessary to break the spell of inertia and frustration is this Act as if it were impossible to fail. That is the talisman, the formula, the command of right-about-face which turns us from failure towards success. - Dorthea Bragg

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