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.
the measure of the property of inertia.
Compare , (def 2a), .
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
- Inertial observer
noun 1. a hypothetical observer who is not accelerated with respect to an inertial system. Newton’s laws of motion and the special theory of relativity apply to the measurements which would be made by such observers
noun, Navigation. 1. self-contained navigational devices used in inertial guidance, along with their mounting.
noun, Physics. 1. a frame of reference in which a body remains at rest or moves with constant linear velocity unless acted upon by forces: any frame of reference that moves with constant velocity relative to an inertial system is itself an inertial system. noun 1. a frame of reference within which bodies are not […]
noun 1. a U.S. two-stage, solid-propellant rocket used to boost a relatively heavy spacecraft from a low earth orbit into a planetary trajectory or an elliptical transfer orbit. Abbreviation: IUS.