How gravity would change if we could travel through a hole from one side of the earth to the other?
109780
As you move "downward" towards the center of the Earth, gravity will decrease. As you pass through the exact, physical center of Earth, gravity will be zero. As you move away from the center, gravity will begin to increase.\n\nYou can roughly compute the force of gravity with this formula --\n\ng = G*m/r^2\n\ng - gravitational force in Newtons\nG - gravitational constant (6.673^minus 11)\nm - mass of Earth\nr - distance from center of mass
589261
So if you dug a tunnel through the Earth, ignoring the molten lava, and if you fell through the tunnel you would indeed get stuck in the center of Earth's gravity well.
21030
Assuming you have a tunnel that goes through the earth, take aside the fact you would survive the temperatures and such at the center, assuming there's no resistance (vacumn like environment), you would fall into the hole... accelerate to terminal velocity...pass the center, and slowly decelerating, until you reach back a speed of 0, where you will be at the other end of the hole, whereapart the whole process would start all over again unless you grasp the edge :)\n\nConsidering that the fact there's air, you'll encounter resistence, meaning you will accelerate to the center, start slowing down, but fall short of reaching the other end, then you will fall to the center again, fall even shorter of your original jumping position, and you'll oscillate back and forth until you indeed get stuck in the center of the earth.
9991
To a first-order approximation the Earth is round.  This\nis due to gravity.  Gravity pulls with equal strength in all\ndirections; therefore any variations from a spherical\nshape will lead to gravitational forces that\nbring the shape back into that of a sphere.\n \nThis is without considering the rotation of the earth,\nhowever.  The rotation of the earth adds centrifugal\neffects, which cause the earth to bulge slightly at\nits equator and flatten slightly at its poles.\n(This is like twirling a rock on the end of a string\nand then letting go--the rock flies away from the\ntwirler.)  Because of these centrifugal effects, the\ndistance from the center of the earth to the surface\nof the earth is about 0.33% shorter at the poles\ncompared to the equator.
280629
We would never FEEL it rotate because it acts directly opposite to gravity. The only way we would feel it it if it CHANGED in velocity.
647859
Neglecting all factors, including air resistance, you would fall faster and faster until you passed the center going really fast, and "fall" up to the surface on the other side of the Earth, slower and slower, until you stopped at the surface on the other side. To someone standing there it would seem as if you had been been thrown up from deep in the hole just hard enough to reach the surface. The time it would take to go through the Earth this way would be the same as the time it would take to complete half an orbit around the world, or about 45 minutes.
374485
you wont stop "falling" once you got to the ceter of the earth, but by that time you would have a bunch of speed. gravity woulnd't overcome this speed until you got almost all the way to the other side of earth - the whole way assuming earth is a perfect sphere and there is no air resistance. you would basically be a pendulum going back and forth - a pendulum or a swing stops falling in the middle but keeps going because it still has speed. air resitance would eventually slow you down until you want shorter and shorter distances and wound up in the center of the earth, then you would have to climb out. if you were smart, you would grab onto the wall the first time you reached the other side, and climb out only a short distance.\n\nalso the first guy is wrong and the 4th one is right, gravity decreases when you go into the earth - it is strongest right on the surface.
1013973
Gravity can move bend and obsorb light ie. black hole
806969
Hmmm change in gravity?\n\nYou need to send a free sample of hair dye to NASA so they can sent it out in space and test it for you.
398725
I am afraid the previous answer & the assumption in the question are both wrong. Water 'plug-hole spin'  is NOT affected by which side of the equator or the spin of the earth. It is affected by local currents & irregulaities in the surface of the bowl. If you are careful, you can prove this at home, but it takes a lot of patience.\n\nBlack holes DO actually SPIN. See the link below, for an example of using spin to get energy out of a black hole. Also read some modern theory on black holes, they eject plenty of stuff!
413063
This is usually called tidal friction.\n\nThe gravitational flux between two bodies is simply the well-know gravitational equation.  Calculating the heat absorbed/lost by a planet is another much more complicated matter.  There are several mathematical models used, but since some constants aren't well-known, the models usually have a large amount of error.  These are problems that people get Ph.D's just for doing a small amount of work on them, so they're not simple or easily solved systems.\n\nThe earth's oceans are currently assumed to absorb a lot of the energy, so it doesn't go directly into the Earth's crust.  \n\nSee the (vague) reference below.
300802
if the point is big the gravity don't effect it much but if it is small gravity will effect it i forgot the whole explanation though \n\nyou could try this link
320636
technichally speaking, if the earth were hollow, we wouldn't have gravity. If the earth is hollow, then where do we get volcanoes from? Figure it out.
351770
If your hole is nice and air-conditioned, and you don't have to worry about incinerating in the heat of the Earth's core, then you would free fall until you got near the center, at which time you would gradually slow down due to the gravitational pull of the larger mass behind you. It's the mass of the Earth that holds you down to the ground. If you were in the dead center of it you would feel weightless because the mass would be pulling you in all directions equally. So you are heading for the other side, your velocity slowing until you would come to a stop somewhere near the surface, and then fall back into the hole going the other way, and once again slowing to a stop at the other end, repeatedly falling back and forth until air resistance brought you to a complete stop in the center, just like a swaying pendulum.
804491
If there was a hole right through the center of the earth?\n\nAlright.  In order to understand the answer, you have to understand the difference between potential energy and kinetic energy.  Potential energy is stored up energy.  (Like a rubber band stretched and ready to snap.)  Kinetic energy is moving energy.  (Like the rubber band in the process of snapping.  \n\nThe moment that a person steps over the hole through the earth., that person has complete potential energy.  The earth's gravitation is pulling on them, but they are not yet falling.  As they fall, that potential energy is converting to kinetic energy.  They fall faster and faster.  Once they reach the center of the earth, they have no potential energy, only kinetic energy.  \n\nThis kinetic energy keeps them moving down the hole towards the other side of the earth.  As they are moving away from the earth's gravitational pull, they slow down.  The kinetic energy is converting back to potential.  \n\nOnce they reach the surface, they once again have full potential energy and zero kinetic.  \n\nSo, they yo-yo back and forth between the two mouths of the tunnel.\n\nWhat ends up happening depends on if you are taking air resistance into concideration.  \n\nIn a complete vacuum, the person would yo-yo between the two openings of the tunnel forever.   The person's potential and kinetic energies would have an inverse relationship.  Back and forth.\n\nIf you are taking air resistance into account, then some of the energy is lost from friction between the person falling and the air.  (It's lost through heat energy.)  During each yo-yo, the person's fall would be less and less.  Eventually, all of the energy in the person would be lost through the heat energy and the person would be stuck in the center of the earth, suspended there for all time.\n\nKinda cool, huh?
378723
The closer you get to a black hole, the greater the gravity gradient gets.  That is, the force of gravity is much stronger near the black hole than far away.\n\nAs you fell into the BH, the difference between the force of gravity at your feet and your head would become so great that your body would be ripped in two.  Then as the two pieces of you fell closer to the hole, the gravity gradient would increase still more, and the two pieces would be ripped into four.  This would continue until, by the time you reached the event horizon, you would be ripped into countless tiny pieces.  \n\nThe little pieces of you would fall through the event horizon, then continue falling and ripping into smaller pieces until they reached the singularity at the center of the BH.  No one knows what would happen then, because a sinuglarity does not obey the laws of physics that we know; gravity and density are infinite there.
648259
depends if the gravity is the same, since gravity has the same effect on time as acceleration does. but it wouldn't be a noticeable amount on earth.