Why can’t you use a rope to rescue a person from a black hole?
It is not about the force. It is the lightcone.
There’s no way out of a black hole. Once you fall in, you are as good as toast. You will be spaghetified, sucked in, and dead. Not even light can escape a black hole.
All gravitating bodies, planets, stars, and so on have an escape velocity. This is the velocity you need in order to escape that body’s gravity from its surface. If you are higher than the surface, your escape velocity will be lower. If you are below its surface, then escape velocity doesn’t make a lot of sense.
A black hole is small enough that its escape velocity is greater than light. In fact, as far as we know, black holes have no surface at all. They are just points called singularities. Instead, they have an imaginary surface around them we call the event horizon. This imaginary surface is where the escape velocity is equal to light speed, the fastest speed anything in the universe can travel. Any closer to the black hole and the escape velocity is more than that.
It make sense that, if nothing can go faster than light, and the escape velocity is greater than that, then naturally, you can’t escape.
There is one problem with that logic that always bothered me, until I learned more about the…
