how far from earth gravity is zero?

Answer 1

The pull of the Earth's gravity decreases at the rate of the distance you are from Earth squared, so you never really get away from it, though it quickly drops off. In low earth orbit, for instance you are still under the effects of gravity, because you are in orbit, but things can float about in the cabin of the space shuttle.

There is a special point between any two celestial bodies where the pull of gravity from one exactly balances the pull of the gravity from the other. That is the LaGrange point. The net effect of gravity at this point is zero.

Answer 2

Gravity is never zero.
ANY object with mass in the universe is gravitationally attracted to EVERY other object with mass.

The only way to completely escape gravity would be to travel an infinite distance away from all object with mass, which is impossible.

Newton's Law of Universal Gravitation is given as,
F = (G * M * m) / r^2
where G is the Universal gravitational constant, M and m are the masses of the two objects in question, and r is the radial distance between the two objects' centers of mass.
You can see that the gravitational force only goes to zero as the distance, r, goes to infinity.

Also,
There is not simply a barrier one crosses in which one becomes "Weightless" when going into space. Although one might feel weightless in orbit, this is caused by you continually 'falling' towards the ground, you are still very much attracted to Earth by gravity.

Answer 3

The net gravitational force on an object is zero at the 'center of gravity' of the universe. Take a vector sum of the force vectors from each particle in the universe. The center of gravity is where that sum is zero. We currently have no way of knowing where that is. But if there was a Big Bang, it's probably close to that point.

Answer 4

Technically, gravity is never zero, although it does become negligible if you're far enough from the Earth, depending on how you like to define negligible. However, "zero-gravity" effects are achieved by letting a plane dive from a high altitude at the rate of gravitational acceleration or by being on a space craft in freefall orbit around the Earth.

Answer 5

In theoretical terms, at infinity. But practically, you can calculate it. The force of gravity equals (G*M*m)/(r^2). G is universal gravitational constant, M is mass of the earth, m is the mass of the test body and r is the distance from the centre of the earth. Now, just calculate the value of r as the force of gravity tends to zero.

Answer 6

Hi, most of the previous questions are correct, the effect of gravity is more or less felt everywhere, by everything, BUT I think I spotted something the other havent mentiond.

To counter-effect the force of gravity you have to have to be moving at an equal speed than its gravitational pull AWAY FROM the body/mass. This is not the same as sky diving or plane diving. That is only a relative situation - think about it. we wouldn't fall downwards if we were weightless?

The speeds concerned are forever changing as there are lots of sums about proportional effects of forces of attraction (which I dont know!!)

also... I'll shut up in a sec.... 'centrifugal force' is NOT the same as 'gravitational force'. NEVER GET THEM CONFUSED!!

Answer 7

Basically Never! as you would be affected by the Sun's gravity and Earth's gravity even at very great distances it would be just harder to measure it as it got less and less but then you would be affected by the other stars and planets as well

Answer 8

Gravity decreases 1 ppm for every 3m increase in height.

Answer 9

the gravity would be zero in the void between galaxy and next galaxy...anywhere in galaxy gravity is never zero

Answer 10

U need to think of it as attraction between 2 bodies. so that connects to the gravity of the sun or 93,000,000 miles.