the cause of  the pull ofhe gravity on earth when sun moon earth are lined up?
537829
Tidal forces are based on the gravitational attractive force. The relationship between the masses of the Earth, moon and sun and their distances to each other play critical roles in affecting tides.  \n \nGravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996).\n\nNewton’s law of universal gravitation states that the gravitational attraction between two bodies is directly proportional to their masses, and inversely proportional to the square of the distance between the bodies (Sumich, J.L., 1996; Thurman, H.V., 1994). Therefore, the greater the mass of the objects and the closer they are to each other, the greater the gravitational attraction between them (Ross, D.A. 1995).\n\nThe moon is a major influence on the Earth’s tides, but the sun also generates considerable tidal forces. Solar tides are about half as large as lunar tides and are expressed as a variation of lunar tidal patterns, not as a separate set of tides. When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides—both commonly called spring tides. One week later, when the sun and moon are at right angles to each other, the solar tide partially cancels out the lunar tide and produces moderate tides known as neap tides. During each lunar month, two sets of spring tides and two sets of neap tides occur (Sumich, J.L., 1996).\n\nJust as the angles of the sun, moon and Earth affect tidal heights over the course of a lunar month, so do their distances to one another. Because the moon follows an elliptical path around the Earth, the distance between them varies by about 31,000 miles over the course of a month. Once a month, when the moon is closest to the Earth (at perigee), tide-generating forces are higher than usual, producing above-average ranges in the tides. About two weeks later, when the moon is farthest from the Earth (at apogee), the lunar tide-raising force is smaller, and the tidal ranges are less than average. A similar situation occurs between the Earth and the sun. When the Earth is closest to the sun (perihelion), which occurs about January 2 of each calendar year, the tidal ranges are enhanced. When the Earth is furthest from the sun (aphelion), around July 2, the tidal ranges are reduced (Sumich, J.L., 1996; Thurman, H.V., 1994).
485523
From Wiki\nThe tides on Earth are mostly generated by the Moon's gravitation, with a less significant contribution by the Sun. These gravitational effects are specifically manifested as tidal forces. The combination of the two is responsible for spring and neap tides. Two tidal bulges, one in the direction of the Moon, and one in the opposite direction (figure 1) form as a result of the tidal forces. The buildup of these bulges and their movement around the earth causes an energy loss due to friction. The energy loss decreases the rotational energy of the Earth.\n\nSince the Earth spins faster than the Moon moves around it, the tidal bulges are dragged along with the Earth's surface faster than the Moon moves, and move "in front of the Moon" (figure 2). Because of this, the Earth's gravitational pull on the Moon has a component in the Moon's "forward" direction with respect to its orbit. This component of the gravitational forces between the two bodies acts like a torque on the Earth's rotation, and transfers angular momentum and rotational energy from the Earth's spin to the Moon's orbital movement.
25342
Think rally hard. The moon has gravity just like the earth. Have you ever seen a flag on earth stand that straight? They had a metal pole across the top and the grainy video make it look as if it is fluttering.
207757
There's several factors, the most noticable one is the gravitational effect of the moon, everything has gravity but the moon is very close to earth compared to the sun and other planets so it's effects are greter.\n\nThe moon rotates around the earth and together these, along with the other planets, rotate around the sun.\n\nWhen the sun, the earth and the moon are together in a straight line is when the gravitational pull is at it's strongest - the moon takes about 28 days to go round the earth so this effect happens once a fortnight - once when the alignment is sun moon earth and then when the moon has made a half rotation and the alignment is sun earth moon.  These are the times of the full moon and new moon.\n\nThe seas and oceans are so massive that the full gravitational effect of the moon takes a couple of days to peak and it's for this reason that the highest tides occur shortly after a full moon and a new moon.\n\nThe sun also plays a part but to a lesser extent.  The earth takes a year to go round the sun and the path it takes is an elipse - a slightly squashed circle so twice during the year we are close to the sun and twice we are furthest away from the sun.  The times when we're nearest the sun are the autumnal and vernal equinoxes - we've just had the vernal equinox on 22nd March.  Being closer to the sun means higher high tides and lower low tides and as a result the tides are at the highest and lowest at the start of spring and the start of autumn / fall.\n\nWhen the full or new moon coincides with the vernal or autumnal equinoxes we get exceptionally high tides and as today is a new moon and just a few days after the vernal equinx we're experiencing some of the highest and lowest tides of the year - it'll be six months before they're this high or low again.\n\nOther more localised factors are wind and air pressure.  A strong driving wind will push the seas and ocenas along in front of it (called a strom surge).  An area of high pressure pushes down on the seas and oceans and displaces the water towards areas of low pressure - the low pressure areas effectively 'suck' the water upwards.\n\nWhen several of these factors combine there can be catastrophic high tides leading to serious flooding and loss of lives.  In 1953 a strom surge claimed over 2000 lives in England and the Netherlands and reclaimed over 2,000 square kilometres (800 square miles) of land.
281335
The law you are referring to is the law of inertia, which is directly related to the laws of gravity.  The heat from the sun and it's gravitational pull are what "make the earth go round"
677529
Tides occur because the gravitational force between two bodies decreases with distance. Gravitation is the universal force of attraction between all matter. It holds astronomical bodies together and attracts different bodies toward each other. Because gravity tugs on nearby things more strongly than on distant things, the oceans closest to the Moon, feel the greatest attraction to the Moon. Being fluid, these nearby oceans move upward in response to the Moon's pull, until there is a balance between the upward force from the Moon and the downward force from Earth. The high tide on the far side of the Earth occurs because these most distant oceans feel the least attraction to the Moon. In essence, they are left behind as the Moon pulls the other parts of Earth toward itself with greater force.\n\nThe Moon is steadily moving up. As anyone who climbs long flights of stairs knows, it takes energy to move up. If the Moon is moving up, where does the energy come from? There is only one place it could come from: the spin of Earth. This is a zero-sum game that physicists call the conservation of angular momentum: The total angular momentum in the Earth-Moon system, which related to the energy stored in both rotation and revolution, must remain the same. Since the Moon is gaining angular momentum as it spirals away, Earth must lose the same amount of angular momentum. Earth loses angular momentum because the high tide closest to the Moon is trying to get back directly underneath the Moon, while the high tide farthest from the Moon is trying to get as far away from the Moon as possible. Consequently, the high tides flow westward, and in so doing, they encounter continents and islands. The water pushes against these landmasses, which, because of rotation, are moving eastward. The net result is that the westward motion of the tides -- slowing down the rotation, retards the eastward revolution. The day is getting longer by about 0.002 seconds per century. It does not sound like much, but over billions of years, it adds up.\n\nOn a moonless Earth, the only tides would be from the Sun. The Sun accounts for one-third of the tides on Earth today. Therefore, Earth would still experience some tides and its rotation would still slow down, but not nearly by as much as nonce. A moonless Earth day would be around eight hours long at this time in its life, 4.6 billion years after it formed.\n\nAdditionally, the faster a planet rotates, the faster its winds blow. Higher winds and the shorter days on Earth would have major effects on evolution; imagine what day-to-day life would be like with only three or four hours of sunlight each day, much different than now…\n\nLess protection from meteors and imminent impacts, as you can see, the Moon has shielded us from a cosmic bombardment, just look at its surface.
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If the earth wasnt tilted on its axis, we probably wouldnt have any gravity.  The tilt helps with the gravitational pull of everything and the moon itself.
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Tides are created because the Earth and the moon are attracted to each other, just like magnets are attracted to each other. The moon tries to pull at anything on the Earth to bring it closer. But, the Earth is able to hold onto everything except the water. Since the water is always moving, the Earth cannot hold onto it, and the moon is able to pull at it. Each day, there are two high tides and two low tides. The ocean is constantly moving from high tide to low tide, and then back to high tide. There is about 12 hours and 25 minutes between the two high tides.\n\nSpring Tides\nWhen the moon is full or new, the gravitational pull of the moon and sun are combined. At these times, the high tides are very high and the low tides are very low. This is known as a spring high tide. Spring tides are especially strong tides (they do not have anything to do with the season Spring). They occur when the Earth, the Sun, and the Moon are in a line. The gravitational forces of the Moon and the Sun both contribute to the tides. Spring tides occur during the full moon and the new moon.\n\nNeap Tides\nDuring the moon's quarter phases the sun and moon work at right angles, causing the bulges to cancel each other. The result is a smaller difference between high and low tides and is known as a neap tide. Neap tides are especially weak tides. They occur when the gravitational forces of the Moon and the Sun are perpendicular to one another (with respect to the Earth). Neap tides occur during quarter moons. \n\nIf we had a second moon our tide system would be more complicated.
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The force of gravitational attraction that the earth exerts on the moon tending to pull the moon towards its center, is exactly balanced by the centrifugal force (that tends to take the moon away from the earth) on the moon due to its (approximately) uniform circular motion.\n\nMathematically,\n\nFg   =     Fc
887891
No, it isn't true.  Gravity can't be blocked simply by putting one object in front of another.\n\nThat being said, there is some, very small agreement with the statement.  The Sun, the Moon and the Earth all pull at you through the force of gravity.  The direction of the forces are from you towards the centers of each of these bodies.  When the Sun and the Moon line up in a total solar eclipse, their gravitational forces will combine and, if you are in the path of the shadow, you may weigh a few micrograms to milligrams less for a very short time.  However, if you are on the other side of the Earth from the shadow, all three bodies will be pulling on you in line and your weight will go up by micrograms or milligrams.\n\nFrankly, given that the movie is on VH-1, I'm surprised they tried any type of scientific statement when they could have put another fifteen seconds of barely contained boobage.
289483
tides are a result of the gravitational pull from the moon
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There is something to this.  The net angular momentum of the Earth-Moon system is such that it is fairly stable to the small torques introduced by other planets.  For instance, the orientation of Mars' rotational axis is believed to have changed dramatically over time.  This is shown with numerical models. \n\nThe moon is moving farther away from the earth.  Angular momentum  is transfered by tides.  The tidal bulge of the Earth remains oriented towards the moon.  The earth rotates under this bulge and drags it forward a bit. The gravity of the bulge itself then pulls the moon ahead in its orbit some.  The net effect is the earth's rotation slows, and moon moves to a slightly larger orbit.\n\nAt some point, the Moon's orbital period will be the same length as the Earth's rotational period and the Earth and moon will be tidally locked to one another. \n\nRegardless, the entire system will still have a lot of angular momentum and the Earth will be fairly immune to significant changes to the obliquity of its rotation.
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The Earth as a whole can be considered a single mass, m1 and another object, for example you, or the moon, or an apple, is considered another mass, m2. The gravity force between them is given as:\n\nF = G*[(m1*m2)/r^2]\n\nWhere G is the Gravitational constant and is equal to:\n6.67x10^-11 N m^2/kg^2\n\nSo the root cause of the Earth's gravity is it's mass and how it pulls on other masses as given by the equation above. \n\nYou can see that with two very massive objects like the Earth and the Sun you get a much bigger force than with smaller masses like 2 people. THat's why the Earth is kept in orbit about the Sun but you don't feel a force pulling you towards other people for example.
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To be very precise, this is what happens:\n\nAs we are attracted towards the sun by the force of sun's gravity, we continously experience a constantly increasing force, beacuse of the inverse-square law.\nAnd due to this, our momentum is continously increasing.This increase in the momentum causes a centripetal and a centrefugal force on th earth, which results into a hellical orbit.But due the inverse-square relationships, the horizontal component of the helix is nullified as soon as the earth achieves its stability, so it revolves around the sun, without crashing into it.\nAt this point, all of sun's gravitational pull equates mv^2/r, which in tuen accounts for all the centripetal force of the earth.SO, THEREFORE, NO EXCESS FORCE PULLS THE EARTH FURTHER TOWARDS THE SUN, SINCE ALL OF THE FORCE IS EXPENDED IN MAKING IT REVOLVE.
140176
The Sun, Earth, and Moon are all gravitationally tied together. In other words, the interaction of their individual gravitational fields closely relates one to the other. The Earth/Moon system moves around the Sun in a particular orbit. Should the Sun somehow disappear, the movement of the Earth/Moon system would be radically altered. Even the Sun, the largest mass of the three objects, has its movement through space influenced by the gravity of the Earth and Moon. If we could view our Sun from several light years away, we'd notice that it moves through space not in a straight line, but instead a wavy line as the Earth/Moon system tugs at it.
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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.
1159551
The moons gravitational pull does cause the tides, the sun to a lesser extent also exerts a pull.  When the sun and the moon are on the same side of the earth the tidal pull is the greatest, when on the opposite they are the least.