The difference between the equivalence principle in the gravitational field and the inertial frame

This paper mainly discusses the strict distinction between the gravitational field and the inertial frame in the ideal gravitational field, in order to clarify the application scope of the equivalence principle. This paper proves that the effect of gravity on an object is actually a real "force" that is evenly distributed throughout the object, and the object in the process of free fall in the gravitational field is strictly different from the inertial system in free space.

At the same time, there is also a strict distinction between an object stationary in a gravitational field and an object undergoing uniform acceleration. This paper proves that the relativistic velocity transformation effect required by the inertial frame will occur in different directions in an object undergoing uniform acceleration. This paper once again proves the relative independence of inertial systems in space, and the relativistic effect is actually a transformation rule between different inertial systems based on the conservation of energy and momentum.