Think about it this way:
The closer you get to Earth, the greater its gravitational pull becomes. Can you follow me?
If you are really far away in outer space, you slowly drift towards the earth, but the closer you get, the faster you will become...make sense?
After all, gravitational pull is acceleration, and acceleration is measured in m/s² (meters per second squared). In other words: meters per second (unit of measurement for speed), PER SECOND
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Similarly, the closer you get to a black hole, the greater its gravitational pull becomes. Agree?
The thing is, a black hole's gravity is vaaaaaaaaaaaaastly higher than that of earth.
And so, the difference in gravitational pull the closer you get to it, becomes immense.
So great is the difference in fact, that if you were falling toes first into a black hole, the gravitational pull your toes experienced would be faaar greater than what your head experiences, even though your toes and your head are less than 2m apart, because the difference is really that high per unit of measurement the closer you get to it. And the difference only gets higher per unit of measurement the closer you get to the black hole.
As a result, what happens is "spaghettification" (look it up) - your body will literally get pulled and shredded that way.