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Related to inertial force: inertia force
An apparent force, proportional to a body's mass, that appears to affect the body within a noninertial frame but is absent from the point of view of an inertial frame. Centrifugal forces and Coriolis forces are inertial forces.
(General Physics) an imaginary force which an accelerated observer postulates so that he can use the equations appropriate to an inertial observer. See also Coriolis force