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changes.mady.by.user Andrew E Pawl

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Excerpt

A quantitative measure of the resistance of an object to attempts to change its velocity. Mass is often defined as a measure of the quantity of matter in a body.

_Gravitational Mass_, which appears in the Law of Gravitation, is identical to this _Inertial Mass_ . A proper explanation of this involves the _Principle of Equivalence_ and _General Relativity_, and is beyond the scope of this introductory wiki. The interested student is directed toward books on relativity, or to look up these terms on the internet.