reply to post by Sliick
all sources state that it is a VERY weak force. i kept thinking, well if gravity is such a wimp, how can it suck in EVERYTHING (including light) from
light years away?
Well, the equation that describes the gravitational force is:
F = G*M1*M2/R²
G (the gravitational constant) = 6.67*10-11 N-m²/kg² (=Newtons)
m-meters, kg -kilograms
where M1 and M2 are the masses of the two bodies
and R = distance between the two objects
F , of course is very small (or in your terminology, weak) for small masses
and large distances, as you can see from the equation
HOWEVER, since a postulated black hole is EXTREMELY MASSIVE, as a "captive" body gets closer to a black hole, G gets STRONGER by the square of the
distance, since R, the distance, is in the denominator.
This equation clearly shows how a body, once within close distance(the event horizon) to a black hole, will literally get sucked in at unimaginable
speed. I won't get into the time dilation factor or how relativity factors into what that speed is, but hopefully, the discussion of the gravity
equation addresses your concern about the "Weakness" of gravity. It is all relative- no pun intended.