Supposing I am in a non-inertial system and I don't know what forces are acting. How can I test EXPERIMENTALLY and in practice to be in a non inertial system? If I am in a system and I don't know how does it moves and I would make an experiment to test if this is inertial or not, what should I do? For example: in a lift? In a rotating system?
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2You can eg. let a ball fall to the ground. If the ball does something funny, then you know that you are not in an inertial reference frame. – Gonenc Jul 10 '15 at 00:47
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possible duplicate of Is this an inertial frame of reference in relativistic context? – John Rennie Jul 10 '15 at 10:23
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Inertial frame of reference is such that free bodies move with constant velocity. If you detect free body accelerating, the frame is not inertial.
Ján Lalinský
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1How can i say that a body is free ? With an experiment if the system where i am is not inertial. – Jul 09 '15 at 23:22
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This is all well and good, but it is not really complete without a discussion of gravity in classical physics versus in general relativity. Or a link would do. – dmckee --- ex-moderator kitten Jul 09 '15 at 23:25
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@IlarioVitali, body is free if no other body interacts with it. In practice, approximately free body is body for which the effect of the interaction is negligible during the time period of interest. – Ján Lalinský Jul 10 '15 at 18:22