According to my understanding of General Relativity, gravity is not a force and an observer which is falling freely under the influence of gravity should be considered inertial. Now, I have come across some texts about black holes that say a body approaching black hole will be eventually ripped i...

It is the equivalence principle that provides the bridge between the ideal $SR$ model and the real world. According to it, we can find at each event a set of local inertial frames (LIFS), which may be small or large depending on I.) Distribution of nearby masses ii.) Accuracy we require Rindler:...