Earth has gravitational force as per the great scientist NEWTON.AS the wall is made up of same earth mud.when any object strikes the wall it has to attract due to possing gravitational energy .but it is not happening so,why it is so ? can u please justify for my sake ......
215381
The wall does attract objects gravitationaly, but gravity is an exceptionally weak force, and is only noticeable to us humans when dealing with extremely massive objects (like planets, for example).  Gravity is so weak, in fact, that all you have to do to overcome the gravitational pull of the entire Earth is jump.
309482
Ummm.... relativity doesn't have anything to do with it.\n\nBoth objects, regardless of their mass, are pulled toward Earth by the exact same gravitational force, and therefor are accelerated in exactly the same way (9.8 m/s^2) Thus they fall at the same rate.
103197
I think,to a good approximation, at the centre you would not feel an appreciable gravitational field from the mass of the earth. \n\nIt's a nice result in physics that if you're on the interior of a spherical shell of mass then you feel no gravitational force. You can think of the centre as being surrounded by layer after layer of spherical shells of radius ~0 up to the radius of the earth.\n\nIf you do the calculation, once you start going interior to the earth the gravitational attraction varies linearly with distance from the centre-going from 9.81m/s^2 at the surface to 0 m/s^2 at the centre.\n\nOutrageous!
90095
the earth doesnt fly towards the sun cuz there r more than one force acting upon it...theres the gravitational pull the sun has on the earth as well as the fact that the moon wants to remain in motion in the same direction.this applies to newtons 1rd law of motion(his first law is that an object will remain at rest until acted upon by another object or it will remain in motion until acted upon by an object..in other words,its inertia)...since the earth has both a side movement and the gravitational pull from the sun...those 2 forces cause the earth to orbit around the sun and not fly towards it or away from it. if u dont understand this...email me (pulga0888@yahoo.com) and ill try to explain it better..........now for ur second question...wat makes the earth spin...the earth spins because of the rotation of the magna and stuff in the earths core..well in the convection zone...im pretty sure thats the answer to the second question but im not positive...if u want me to check then email me.
410636
Interesting question.  You can extend it - why does the Earth continue to turn on its axis?  And circle the sun?  Why does the sun circle the center of the galaxy?  Why do things keep going, year after year for billions and billions of years?\n\nNewton thought about this and came up with one of his famous laws:  Without an external force, a body in motion stays in motion, a body at rest stays at rest.\n\nThe second half is easy.  Put a rock on the floor and it will stay there forever until you pick it up.  It won't move without an external force.  So what if you shoot a bullet into the air.  We all know it falls back, but why?  Because the force of gravity acts on it.  Take away gravity and it will still stop.  Why?  Because the friction of air on the bullet's surface will slow it down and finally stop it.  Take away air, take away gravity, and the bullet will go on forever.\n\nSo to answer your question:  Simply put, the asteroids have no forces to stop them.  Gravity keeps them trapped around the sun, but they outside of the range where they fall in, so they simply continue to go around, just like the planets such as Earth.  The asteroids started in motion at the formation of the solar system 4.5 billion years ago, and except for random collisions that altered courses and accelerated (or decelerated) the rocks, no force has acted on them to slow them down.  A perfect example of Newton's law, even more amazing because Newton did not know of the existence of asteroids.
377495
First of all, there's no such thing as "Centrifugal Force".  What people are seeing is Momentum...\n\nGravity is acting as a Centripital force pulling the earth into an orbit against momentum.\n\nRight now the Earth is moving about 66,000 MPH in it's orbit.  This would be constant if we were alone in the solar system.  But we're not.\n\nThe Gravity from other bodies in our solar system causes us to slow down and speed up, and as we do, the earth does fall closer to the Sun or even move further out...  \n\nIt is possible that an errant massive body be added to our system could cause the Earth's orbit to falter and fail, but for now were in a fairly steady state of accelerating and decelerating, and we're holding our own against the Sun's Siren call of Gravity and Death...
658175
Gravity is not caused by the earth's spin. Gravity is a property inherent in matter, caused by the earth's mass.\n\nCentrifugal force causes things to push away from the center of rotation. So the centrifugal force of the earth's spin actually reduces the force of gravity -- but just a little, because gravity is much stronger than the centrifugal force.\n\nBut if you have a very sensitive detector, you can measure that the force of gravity at the North Pole is a bit greater than at the Equator, because there is no centrifugal force there.
484164
Gas, air, the atmosphere - it's made up of molecules of gas, each of which has mass.  That mass is attracted to the Earth by gravity.  Light as air is, it still has mass that it captured by Earth's gravity.  When an asteroid  comes along and smacks into the Earth, water vaper and air are throw far out into space, several hundreds of miles (the atmosphere is only about 100 miles high).  However, it all comes back due to the force of gravity.\n\nHowever, Earth's gravity is not strong enough to hold the lightest elements, hydrogen and helium.  That is the reason Earth is a small rocky planet and not a gas giant like Jupiter or Saturn, or even the sun.  Get big enough and you can attract even the lightest elements - which adds mass - which attracts more gas - which adds more mass - etc etc etc.\n\nThat's why your idea, unfortunately, won't work.  Gravity.
251293
Due to Newton's Law of Gravitational Force (see link), as the distance between two objects decreases, the gravitational force will increase exponentially.  \n\nIt all depends on your position in reference to the center of mass.  If you are on the surface of the earth, your distance from the earth is normally defined as the distance from you to the center of the earth, or center of mass.  \n\nAs you get closer to the center though, the force due to gravity changes differentially since your position in the mass itself is changing and gravitational forces are acting on you from various directions (the earth can be thought of as a sum of different aggregate masses at this point).  Therefore, the gravitational force of the earth will be "less" at the center, since the sum of all aggregate forces would be acting in opposition of each other.  However, since gravity is a relatively weak force, it would not be your biggest concern, because, at the center of the earth, it's not the force of gravity on you that matters, it's the pressure and temperature that will kill you.\n\nMagnetic and gravitational forces are completely separate types of forces and should not be considered in the formulation of this answer.
295982
Yes, a gravitational field can and does exist within other gravitational fields.  All masses in the universe exert an attractive force on all other masses in the universe through a force known as gravity.  Gravity is a vector quantity meaning it has a direction.  These forces act in different directions and cancel each other out. To keep from getting too technical take this example.\nYou are standing on the surface of the Earth, within its gravitational field.  The Earth attracts you to its surface because of the force known as gravity. You, having mass, also exert a force of attraction on the Earth. The reason you do not notice your attractive force on the Earth is that the earth's mass is so much larger than your own. The earth acts a force in one direction, you act a force in the opposite, the result is the net force in the system.(You bening pulled toward the larger mass, Earth)\nThis can be proven mathematically with the formula \nFg=[G(me)(m)]/d^2\n\nG being the gravitational constant, multiplied by me, representing the mass of the earth, and multiplied by m, representing your mass, divided by the distance between you and the earth's center of gravity squared.
143274
For the first case A marble on a (perfectly) flat surface, will remain in that state until energy of some kind is added.\n\nFor the second case to be as close to perfect conditions you would need to have a moving object out in deep space away from other bodies, because gravity will always be an effect, and in space to avoid the friction of the air.\n\nBut in simple terms the same marble on the flat surface give a push will move until external forces stop it, friction from the air and from contact with the surface.
458310
The attractive force of the "magnet earth" is much smaller than it's gravitational force. In fact it's negligibly small. Proof: put an iron object on the table, like a knife. Despite it being much more closer to the earth than the moon, it will not budge.
504994
Let's clear up our terms a little bit.\n\nGravity only generally occurs between things of mass.  And it is pretty much independant of what the mass is doing.  And I say pretty much because there are things that can create or destroy mass... but in a general sense it all comes down to the mass.\n\nNow, as astronomical bodies form, they tend to get a spin.  Because of the conservation of angular momentum, things that suck up more mass tend to have more spin than others.  These are, however, tendancies, NOT necessities.\n\nCase in point - the Earth.  Because of the tides, the spin of the Earth is slowing down.  We used to have twelve-hour days millions and millions of years ago, but now they're twice as long.  Has this affected the force of gravity?  Not a bit.  The same mass is present, and it's causing the same amount of gravity.\n\nWhat your friend may be confused by is what is sometimes called centrifugal force (a physicist would probably just call it inertia, though).  Although gravity pulls us down to the centre of the Earth, the motion of spin carries us away from the centre, counteracting gravity.  This means if you take a tool to measure gravity near the equator, you'll get a lower reading then you will when you measure it at the axis.  The force of gravity hasn't changed at all, but the spin is creating another force that is mitigating gravity's effects.  On Earth, this force is pretty small, but it's concievable that it could amount to a huge amount on a fast-enough spinning object... say, a space station with almost no gravity, but which was spinning fast to simulate gravity but pulling out instead of in.\n\nSo in a literal sense, you are completely right.  Gravity has ONLY to do with mass (well, mass and distance).  In a squishier sense, your friend is sort of right, in that spin can change the APPARENT force of gravity in local areas and that objects with large gravities also tend to have large spins.\n\nHope that helps!
602570
every one is wrong except one guy it cuz of centriptal force if u want to get in detail here it is   consider earth rotating along its axis gravity is acting along centre any force acting  opposite to it will reduse its effect   take a body on equator as earth is rotating body will have a force acting opposite to tat of gravity it is same as on feel in car when it is taking turn out side right  but when body is at pole it wont have tat force cuz pole is on the axis imagine whole situation  magnetic force wont have ny effect
407832
To understand this quandary you must look at a much bigger picture. since gravitational force is determined by an objects mass the earth actually exerts a much greater force on the object than the object exerts on the earth. Now this is where you must remember Newton's second law - if an unbalanced force acts on an object the object will accelerate in the direction of the force. The unbalanced force is the force of gravity the larger mass (earth in this case) exerts on the smaller object. The acceleration in the direction of the force is what we call gravity. It is true that the object exerts a reaction force but the maximum force it exerts is only the force of gravity it can generate based on it's mass. Since it weighs less it's force is not strong enough to move the earth.
116604
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"
101817
its the same as why does gravity not apply in the subatomic...when we know the answer a new dawning in science will amaze the world...