213. 2023年5月19日 09:05:11 : cdsqSqFVzc : YVp1S200bGdtU2c=[1]
Local Inertial Frame (again) (クリ)
Every mass point is either in an inertial (unaccelerated) frame or accelerated frame. If a rigid homogeneous cuboid is in free-falling, every mass point is in accelerated frame. In this cuboid, there can be no inertial frame even locally.
P.S. This difference is not fictitious but absolute.
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