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Are you referring to the fact that in GR there are no forces, just trajectories ?If we look at classical gravity, the gravitational force is function of mass and distance. With GR the same phenomena is now a function of space-time.

The momentum of the rock breaks the glass. Gravity doesn't come into it.This works well for large mass. But if I threw a rock of mass M at a window, is the GR distortion in space-time from that little rock sufficient to explain the potential affect that overcomes the strong the EM forces that are binding the glass together?

It's the other way round - Newtonian theory is a weak-field approximation of GR.Is GR a Newtonian approximation if we assume high mass, but does it break down at low mass?

I don't follow thisAnother way to look at it, can space-time distortions gain momentum if acted upon by a force to create enhanced space-time affects at low velocity? I could have used a small iron magnetic for the GR space-time, and used EM force for momentum.