出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/05/04 18:22 UTC 版)
In physics, an inertial frame of reference (also inertial reference frame or inertial frame or Galilean reference frame) is a frame of reference that describes time homogeneously and space homogeneously, isotropically, and in a time independent manner. All inertial frames are in a state of constant, rectilinear motion with respect to one another; they are not accelerating (in the sense of proper acceleration that would be detected by an accelerometer). Measurements in one inertial frame can be converted to measurements in another by a simple transformation (the Galilean transformation in Newtonian physics and the Lorentz transformation in special relativity). In general relativity, an inertial reference frame is only an approximation that applies in a region that is small enough for the curvature of space to be negligible.