inertial mass


nounPhysics.
  1. the mass of a body as determined by the second law of motion from the acceleration of the body when it is subjected to a force that is not due to gravity.

  2. the measure of the property of inertia.: Compare Eötvös experiment, inertia (def. 2a), gravitational mass.

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British Dictionary definitions for inertial mass

inertial mass

noun
  1. the mass of a body as determined by its momentum, as opposed to gravitational mass. The acceleration of a falling body is inversely proportional to its inertial mass but directly proportional to its gravitational mass: as all falling bodies have the same constant acceleration the two types of mass must be equal

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