Which of the following would have the greatest force of gravitational attraction.

1) The Universal gravitaional law, stated by Sir. Isaac Newton, states that the force of gravitational attraction between two objects is directly proportional to the product of their masses and inverse to the square of the distance that separates their centers.

2) Mathematically, it was expressed in this form:

F = G * m₁ * m₂ / d².

where G is the proportinality constant, m₁ and m₂ and the masses of the objects, and d is the distance that separates the centers of the two objects.

3) Then, the answer is that the greatest for of gravitaional attraction is:

- that of the two objects for which the product of the masses is the greates (assumin same distance between them), or

- that of the two objects that are closer (assuming the product of the masses is the same).

The thing with the greatest mass, that occupies the smallest volume so you can get really close to it.

Those requirements are met perfectly by a black hole.