A very important property of pseudo-forces is that they are always proportional to the masses; the same is true for gravity. There is therefore a possibility that gravity is also a pseudo-force. Could it be that gravity is caused by the lack of a proper coordinate system? After all, we can always get a force proportional to the mass, just imagine that the body is accelerating. For example, a person placed in a box that is standing on the ground finds that something is pressing him to the floor with a force proportional to his mass. If there were no earth at all, and the box was still at rest, then a person would be floating in space. On the other hand, if again there was no earth, and someone was dragging the box up with an acceleration of g, then the person in the box, analyzing the physics of this phenomenon, would find a pseudo-force pressing it to the floor in the same way as gravity does.
Einstein put forward the famous hypothesis that acceleration causes an imitation (similarity) of gravity, that the acceleration forces (pseudo — forces) cannot be distinguished from the forces of gravity; it is impossible to say which part of a given force is gravity and which is pseudo — force.
It would seem that nothing prevents us from considering gravity as a pseudo-force, to say that we are pressed down because we are accelerated up; but what about the inhabitants of New Zealand, on the other side of the Earth — where does it accelerate them? Einstein realized that gravity can be considered a pseudo-force at only one point at a time; his reasoning led to the assumption that the geometry of the world is more complex than the usual geometry of Euclid. Our discussion of the issue is purely qualitative and does not pretend to anything other than a general idea.
To explain in general terms how gravity can be the result of the action of pseudo-forces, we will give a purely geometric example that has nothing to do with the true state of things. Let's assume that we live in a two-dimensional world and do not know anything about the third dimension. We would think that we were living on a plane, but in fact, suppose we were living on a ball; let us now throw an object along our surface, without acting on it by any other forces. How would it move? It would seem to us that it moves in a straight line, but since there is no third dimension and it would have to remain on the surface of the ball, it would move along the shortest distance on the sphere, i.e., along the circumference of a large circle. We will throw another object in the same way, but in a different direction; it will also go along the arc of a large circle. We think that we are on a plane, and therefore hope that the distance between two objects will grow linearly over time. But careful observations will suddenly find that at a sufficiently large distance, objects will again begin to approach each other, as if they were attracting each other. But they are not attracted to each other; it is all about geometry, it is something "wonderful"that happens to it. Although this picture does not concern the geometry of Euclid (it does not show us what is "wonderful" in it), it shows that by noticeably distorting the geometry, all gravity can be attributed to pseudo-force. This is the general idea of Einstein's theory of gravity (Feynman Lectures on Physics Chapter 12 Pseudo-forces)