When you jump on Earth, you do not fall towards a black hole because the gravitational force between you and the black hole is relatively weak compared to the gravitational force between you and the Earth.
Gravity is a fundamental force that attracts objects with mass towards each other. The strength of the gravitational force depends on the masses of the objects involved and the distance between them. In the case of a black hole, its gravitational pull is indeed extremely strong due to its immense mass packed into a small volume. However, the gravitational force weakens as you move farther away from the source.
The reason you don't fall towards a black hole while standing on Earth is because the Earth's gravitational force is much stronger at the distance you are from it compared to the gravitational force from the black hole. Earth's mass is concentrated within its radius, so its gravity dominates over smaller objects like humans.
To fall into a black hole, you would need to come very close to it, within a region called the event horizon. This is the boundary beyond which nothing, including light, can escape the gravitational pull of the black hole. The event horizon is typically quite small, and unless you are extremely close to a black hole, its gravitational influence is negligible compared to other massive objects like planets or stars.
In summary, while black holes have incredibly strong gravitational forces near their event horizons, their influence is not significant at large distances. On Earth, the gravitational pull from the black hole is much weaker than the gravitational pull from the Earth itself, which is why you don't fall towards the black hole when you jump.