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[Phys-l] Inertia frame of reference



Hi everyone,

Does anyone know which is the best definition on inertia frame of reference?

Ohanian defines "inertial reference frame" as a frame in which Newton’s
laws of motion are valid to a first approximation.
Ludwig Lange argued that any three material points simultaneously projected from a single point, and moving freely in noncoplanar directions, constitute an inertial system.
In John Denker's website, he suggests "a freely-falling frame". (It seems to suggest accelerated frame of reference.)


Best regards,
Alphonsus

Lange, ‘‘Ueber das Beharrungsgesetz,’’ Ber. der Ko¨nig. Sachsischen
Gesellschaft der Wissenschaften zu Leipzig, Math.-Phys. Klasse 37, 331–
351 ~1885!.