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'''Inertia''' is the [[resistance]] of any [[physical]] object to a [[change]] in its state of [[relative]] [[motion]]. 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 [http://en.wikipedia.org/wiki/ Isaac Newton] defined inertia in Definition 3 of his Philosophiæ Naturalis Principia Mathematica, which states:[1]

'''Inertia''' is the [[resistance]] of any [[physical]] object to a [[change]] in its state of [[relative]] [[motion]]. 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 [http://en.wikipedia.org/wiki/ Isaac Newton] defined inertia in Definition 3 of his Philosophiæ Naturalis Principia Mathematica, which states:[1]