I've read quite a few online explanations of how curved spacetime is the reason objects are drawn to each other, and that gravity is an illusion. Most of them follow the same path:
- explain what geodesic is, and how it can actually be a straight line.
- explain how matter warps spacetime.
- make a conclusion that an object is not pulled by gravity, but instead it tries to follow the straight line which is actually a geodesic.
What i don't understand is the following theoretical situation. Lets suppose we have Earth that doesn't spin, doesn't move around the Sun, or in the Galaxy, or Universe, Earth is absolutely stationary. And there is a person on its surface holding a stone. The stone is then released. If there are no forces that are attached to it, why would it start moving along any geodesic at all? At this point it doesn't even matter how warped the geodesic is if there is nothing to push it along the way in the first place.