earth has more gravitational force than moon, then why it is not attracting moon and makes it collide on earth
451082
That is because that force is justly balanced by the speed of the moon in its orbit, about 1 km/sec. So rather than falling ON the earth, the moon is falling AROUND the earth.
607158
Yes. For two reasons:\n1- Gravity and the causes between earth and moon\n2- Subconscious of people who are influenced under articles, news and stories about this issue! Which I think is stronger than the gravity of moon!
414408
Yes, the radius of the moon's orbit is currently increasing by about 3.8 cm (about 1.5 inches) every year.  This happens because the moon raises tides on the Earth.  Because the Earth rotates faster than the moon orbits the Earth, the tidal "bulge" of the Earth on the side nearest the moon actually leads, or is in front of, the position of the moon in its orbit (see diagrams in sources given below). That "extra" mass of the Earth's tidal bulge acts to accelerate the moon in its orbit, increasing its angular momentum, and causing the moon's orbit to "spiral out" over time.  Because the angular momentum of the Earth-moon system must be conserved, the Earth's angular momentum must decrease to balance the increase in the moon's momentum, slowing the Earth's rotation rate by a bit (currently, about 15 microseconds/year).  \n\nThese rates have changed over geologic time because the position of the tidal bulge relative to the line connecting the Earth and moon depends on, among other things, the arrangement of continents and oceans on Earth.  These affect the friction affecting the tidal bulge, and therefore its velocity relative to the Earth's rotational velocity.\n\nThe energy of the Earth-moon system must also be conserved, and because the moon gets further from the Earth, its potential energy increases.  Consequently, it's kinetic energy must decrease by an amount exactly equal to the increase in potential energy.  Because the kinetic energy of the moon (or any other object) is proportional to the square of the velocity, the moon's velocity in its orbit is decreasing.\n\nThis process will continue until the moon's orbital period and the Earth's rotational period are equal, at which point the moon and Earth will be "tidally locked", with the same side of each body facing the other body at all times.\n\nThe story doesn't stop here, though.  The Earth-moon system loses angular momentum to the (Earth/moon)-sun system, resulting in an increase in the distance of the center of mass of the Earth+moon from the sun.  This is occurring today, but is a much smaller effect than the lunar tidal effect discussed above.  Once the Earth and moon are tidally locked, though, it will become the dominant effect. As a consequence, the moon's orbital radius will slowly *decrease* until the moon gets somewhere within the Roche limit, at which point (assuming the sun has not become a red giant and expanded beyond the orbit of the Earth by then!) the moon will break apart, most likely forming a ring system around the Earth.\n\nThe Roche limit is the distance from a parent body at which the difference between the gravitational force on a a satellite's near side and a satellite's far side exceeds the gravitational self attraction of the satellite.  Because the moon is made of rock, it has some cohesive strength (i.e., the moon is not just held together by self-gravitation) that will allow it to come within the true Roche limit before being disrupted.
356083
The earth would have more craters than the moon almost, had it not developed an atmosphere.  The atmosphere burns up anything trying to pass through it into a tiny meteorite.\n\nSame reason that mercury is battered with the asteroids.
677265
The Earth and our body exert forces on each other according to Newton's law of gravity.  Essentially mass attracts other mass.
587803
The moon's gravity as felt on earth is indeed much weaker than that of earth, but it acts on the entire area of the earth, in particular on the earth's water layer, a shell 8000 miles in diameter. This weak but widespread gravity force raises slight bulges only a few feet in height, a small distortion of such a huge shell. The two bulges are located close to the areas nearest to and farthest from the moon, the points of greatest and smallest moon gravitational pull. Rotation of the earth causes these bulges to travel around the earth's water layer. Tide can be thought of as an extremely long wave that occurs at predictable times (about twice a day) with predictable amplitudes. Resonant sloshing in the ocean basins amplifies the water height disturbances on shore.\nThe greater tidal amplitude at full and new moons is due to the additive effect of solar gravity when the sun, earth and moon are all more or less in line. Incidentally, the size of ordinary waves is only marginally related to tides.
1028524
The force would be 1/4 what it is now (since gravity follows an inverse-square of distance law). As it is, moon's gravity has next to no effect on our weight on earth, so weight change would be unnoticable. The main effect would be on the tides. Rather than being the primary determinant of tide height, as it is now, the moon would be a secondary influence and the sun would be the primary. This would reduce tidal heights by (very roughly) one half.
180202
Neither. It's the mass of the planet itself. Everything that has mass projects a gravitational field. The more massive an object is, the bigger its gravitational "pull". This is why objects like the Sun can support several large planets, while Pluto (which has a moon about a third the size of it) gets pulled around by its moon.
469016
Great question.\n\nThe reason that they don't collide is that the moon is moving to fast.\n\nCheck this out- when the space shuttle is up in space it is only about a 100-150 miles up there. Why doesn't it just fall out of the sky and crash into the planet? \n\nWell the answer to why things don't fall out the sky is because they are in orbit- duh-. The space shuttle is not only up in space it is also moving sideways at a tremedous speed. The shuttle IS falling out of the sky, but the reason it doesn't ever hit the ground is all that sideways motion. Everytime it starts falling, the earth has moved out of the way ( sideways- remember) so it changes direction and starts to fall again, well guess what the earth has moved out of the way again. This keeps repeating and repeating. in essence anything in orbit- satelites, moons, and space shuttles are always falling but they never seem to get there. That is why the moon never hits the earth. It's important to remember that just because you are in space does not mean gravity is not pullin you down. I assure you if the shuttle was somehow able to suddenly stop it would fall out the sky like a rock. The reason the people in the space shuttle are floating is because they are falling and not because they are in space.\n\nI just have to add a little more to this statement- You know that in freefall ( you jumped out of a airplane ) you can't feel gravity and there is no up or down or sideways. The same thing with being in orbit since you are always falling you can't feel gravity either. One other thing the people that wrote first on this question really need to double check their facts. The Perfect distance and gravity cancelling out stuff is wrong. The moon could and used to be much closer to earth. It also went around earth much faster, but because of tidal action the moon has slowed down and gone into a farther out orbit. The moon even today is leaving the earth at about three inches a year. It is slowing down and so is our day- our day is getting longer because of the moon
1095283
It's because the velocity of the moon pulls the moon outwards and the gravity of the Earth pulls it inward.
1097470
All Mass generates a gravitational pull.\n\nBecause the Moon is so close to the Earth, we come into range of its pull.\n\nWith the moon in pulling in a different direction to Earth's pull, there is a minute difference which is discernible in water because it is continually moving and has a very small mass in itself.\n\nSo when the Moon is above us, the gravitational pull of Earth is slightly less to that the tide level will increase.
498857
It doesnt only attract water. It attracts everything on earth, but we can see it most profoundly with water because its volume can change much more easily. The affects are so little that gravity keeps all the solid objects in place and they are not stretched by the moon, but liquid is easier to move because it is not solid but consists of molecules moving past each other.
315226
because all of these facts can be proven scientifically...it is just a matter of fact that all bodies are attracted to one another with equal and opposite forces.... but the larger the mass the more attraction there is and with gravity the sun has enough mass to keep the earth falling toward it and the earth has enough mass to keep the moon falling toward it and these same forces keep us from flying off the earth.....if you took some physics and chemistry classes it may start to make sense to you but you may still question it until you have taken calculus classes that put out the math to prove it so if you are interested in this maybe you should pursue it more it is all very interesting
303004
I've just read that the gravity on the sun is 28 times greater than the Earth.\n\nIt is gravity that keeps satellites and space stations in an orbit around the Earth, at least if that orbit does not intersect the Earth, because then they would crash, and if that orbit isn't too low above the Earth, because then they'd be slowed down by friction with the outermost layers of the atmosphere of the Earth, and then they'd fall down after all. Gravity also keeps the Moon in its orbit around the Earth, and the Earth and the other planets and comets and asteroids in an orbit around the Sun, and the Sun in an orbit around the centre of the Milky Way Galaxy.
5110
The earth exerts a powerful gravitational attraction for the moon (the moon also exerts a similar but lesser attraction for the earth that raises tides both in the ocean and to a lesser extent in the earth's crust that move about the earth as it spins).  The earth's attraction has raised a bulge in the moon facing earth that is therefore slightly closer to the earth and more strongly attracted.  If a huge meteor struck the moon (as in the past) trying to rotate it, it would have to overcome the earth's attraction for the bulge; thus the moon always faces its bulge toward the earth.  If the moon did spin at one time, the bulge would have helped arrest the motion relative to earth as it deleloped and froze solid.
41122
So the tides are caused by the graviational pull of the sun and the moon.  The moon is a lot closer, so it's pull is much stronger (even though it's the smaller body) and the position of the sun relative to the moon determines how big the difference between high and low tide is (it's bigger when they're lined up).  The moon pulls all the water on the Earth towards it (actually it pulls on everything, but because water is fluid it's the only thing that moves noticeably in response).  So the there's more water on one side of the Earth than the other, so one side has high tide because there's a whole bunch of extra water over there, and the other side has low tide because of all that water that was pulled to the other side.  As the Earth rotates, a different part will be closest to the Moon and the bulge of water will shift.\n\nThe actual mechanics of tides are a bit more complicated than that (I didn't account for the effect of the Earth's rotation, among other things), but that's the general principle that allows there to be tides on both sides.
1081528
Two factors at least determine the spin rate of the Earth. The orbital distance from the Sun where the solid material condensed to form the Earth's body had a fundamental orbital velocity around the sun. As these materials coalesced into the Earth, they had to maintain the energy of their momentum during accretion. This resulted in the basic rotational speed of the solid Earth. Second, the Moon has an effect on the Earth. Since the Earth is about 80 times heavier than the moon, most of this effect is upon the Moon, which now turns at a rotational speed which places the heaviest side always facing the earth. On Earth the moon provides a slight attraction which is most easily seen in tides. This gravitational force is slowing the rotation of the Earth slightly. A possible 3rd factor is if the moon is the result of an impact of a large object on the Earth which caused ejected material to coalesce into the Moon. Such a large impact would effect the rotational speed of the Earth. Or the Moon may be a sister condensation that formed at the same time as the Earth and spun off into its current orbit. This would carry off material and momentum and set the Earth spinning as well.\nIn any case, momentum must be preserved. The final result is the current rotational speeds of both the moon and the Earth.