Galilean relativity principle states that two frames moving with uniform linear motion cannot be distinguished. But is it always possible to realize to be in a non-inertial frame?
In a rotating frame it is surely possible for the observer to realize that because of Coriolis force, which cannot be explained, even supposing the presence of a source of force somewhere.
But in a frame moving linearly, for istance, with acceleration $A$? Coriolis term is not present, so what is the way for the observer in the frame to realize that he is in a non-inertial frame?