How strong is gravity?

Asked Nov 09 '22 at 15:52

Active Nov 09 '22 at 16:02

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How strong is the gravity of general relativity?

How much radial force is required to keep a particle with mass $m$ at a certain distance $r$ from a black hole with mass $M$? We know that Newtonian gravity $$f=\frac{GmM}{r^2}$$ provides a good approximation of the force, $f$, for low energy cases. But what is the exact difference a) for a far-away observer, and b) within the reference frame of the particle?

edited Nov 09 '22 at 16:02

Solomon Slow

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asked Nov 09 '22 at 15:52

Moonraker

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Your question title is vague. The equation is known as Newton's Law of Universal Gravitation, and what you are asking is whether or not the law is meaningful in close proximity to a black hole (i.e., for very large values of $M$ and very small values of $r$.) Your question might attract more interest if its title contained words like "universal gravitation" and "black hole." – Solomon Slow Nov 09 '22 at 16:04
Does this answer your question? What is the weight equation through general relativity? – John Rennie Nov 09 '22 at 16:17
@Solomon Slow: I don't agree with your comment, but thank you for your edits of my question, that's OK. - Indeed, my question is a duplicata, the first answer of the linked question is answering my question! Perhaps my title is a bit more "popular" and a bit easier to find. I did not find the linked question by myself. – Moonraker Nov 09 '22 at 16:47

How strong is gravity?

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