If the suns radius were to shrink until the sun became a black hole, what would happen to sun's force of gravi

If the suns radius were to shrink until the sun became a black hole, how much would the suns force of gravity on the earth be in comparison to what the suns force of gravity is now?

Where the planets orbit, there'd be no change. They're all still at the same distance from the same amount of mass. Closer in, the force of gravity would increase as you got closer to the black hole.

To become a black hole, the sun needs to have a mass at least 120 times its current mass. With time however, as the lighter elements go on to build into forming heavier elements, the star's mass would collapse into itself due to the weight (mass being the same) ..cont

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.. <=> this implies that gravity is not a constant and hence there will be a significant impact on the bodies around it.... and Sun would be a neutron star or a brown dwarf and while the nearby planets might collapse into it...

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the other bigger and farther ones might move closer or have their orbits redefined into elongated and pronounced ellipses intersecting at random points ... and changing and morphing all the time depending on the push and pull of Sun

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It would be exactly the same. The black hole would have the same mass and force of gravitational attraction as does right now.

"... our Sun was suddenly replaced with a black hole of the same mass, Earth's orbit around the Sun would be unchanged. Of course, Earth's temperature would change, and there would be no solar wind or solar magnetic storms affecting us. ..."

http://imagine.gsfc.nasa.gov/docs/scienc…

In my opinion, there would be a change in the earth's orbit, because there would no longer be solar winds pushing on the earth.

The light that hits us from the sun pushes us very slightly away from it. Therefore, the earth would take on an orbit that made it move a little closer to the sun with each circle, than what it was previously.