why is the gravity on earth not  the same in space?
141031
because the earth is causing the gravity... everything in space has gravity. How much gravity depends on the objects mass. Bigger mass bigger gavitational pull.
1186006
Gravity exerts a slightly less force at higher altitudes, even though it is almost non-existent.  If you were to weigh yourself at sea level and then again on top of Mt. Everest, you would weigh less on top of the mountain.  (Again, very, very, very little change).
961066
Your right - gravity is ludicrously weak. The force of gravity of the entire earth on your body is held back by the electrostatic force of a single layer of atoms in your shoes. Gravity is weaker by many orders of magnitude than every other force in the universe.\n\nAnd its a good job it is. Because otherwise we would not exist. \n\nHowever, we have no theory as yet that explains the relative magnitude of forces. It is considered one of the failings of the theories of physics - the parameters that determine the magnitude of the forces simply have to be fed into the equations from observation.
112179
Gravity is a force of attraction that acts between bodies that have mass. It is a physical phenomenon of fundamental importance, profoundly affecting the workings of the world around us and the universe beyond. Most familiarly, it is the gravitational attraction of the earth that endows objects with weight and causes them to fall to the ground when dropped. In fact, gravity is also the reason for the very existence of the earth, the sun and other celestial bodies; without it matter would not have coalesced into these bodies and life as we know it would not exist. Gravity is also responsible for keeping the earth and the other planets in their orbits around the sun, the moon in its orbit around the earth, for the tides, and for various other natural phenomena that we observe.\n\nIn common usage "gravity" and "gravitation" are either used interchangeably, or the distinction is sometimes made that "gravity" is specifically the attractive force of the earth, while "gravitation" is the general property of mutual attraction between bodies of matter. In technical usage, "gravitation" is the tendency of bodies to accelerate towards one another, and "gravity" is the force that some theories use to explain this acceleration.\n\nGravity was rather poorly understood until Isaac Newton formulated his law of gravitation in the 17th century. Newton's theory is still widely used for many practical purposes, though for more advanced work it has been supplanted by Einstein's general relativity. While a great deal is now known about the properties of gravity, the ultimate cause of the gravitational force remains an open question and gravity remains an important topic of scientific research.\n\nContents [hide]\n1 Overview of the history of gravitational theory \n2 The Earth's gravity \n2.1 Comparative gravities of the Earth, Sun, Moon and planets \n3 Mathematical equations for a falling body \n3.1 Gravitational potential \n3.2 Acceleration relative to the rotating Earth \n4 Gravity and astronomy \n4.1 Self-gravitating system \n5 Practical uses of gravity \n6 Newton's law of universal gravitation \n6.1 Acceleration due to gravity \n6.2 Bodies with spatial extent \n6.3 Vector form \n6.4 Gravitational field \n7 Problems with Newton's theory \n7.1 Theoretical concerns \n7.2 Disagreement with observation \n7.3 Newton's reservations \n8 Einstein's theory of gravitation \n8.1 Experimental tests \n9 Comparison with electromagnetic force \n10 Gravity and quantum mechanics \n11 Alternative theories \n11.1 Recent alternative theories \n11.2 Historical alternative theories \n12 Notes \n13 See also \n14 References \n15 External links \n \n\n\n[edit]\nOverview of the history of gravitational theory\nThe first mathematical formulation of gravity was Isaac Newton's law of universal gravitation, published in his 1687 work Principia Mathematica. Professor William Whewell of Cambridge University, author of History of the Inductive Sciences (1837) stated:\n\n"The law of gravitation is indisputably and incomparably the greatest scientific discovery ever made, whether we look at the advance which it involved, the extent of the truth disclosed, or the fundamental and satisfactory nature of this truth." [In A Treasury of Science ed. Harlow Shapley et al, Harper & Bros. NY: 1946] \nAlthough the law of universal gravitation was first clearly and rigorously formulated by Isaac Newton, the phenomenon was observed and recorded by others. Even Ptolemy (c. 100-178) had a vague conception of a force tending toward the center of the Earth which not only kept bodies upon its surface, but in some way upheld the order of the universe. Indian astronomer Brahmagupta (598-668), who followed a heliocentric solar system, was the first to recognize gravity as a force of attraction. He explained that "bodies fall towards the Earth as it is in the nature of the Earth to attract bodies
1000866
that's why mass is not wieght, it is not dependent on gravity. so yes
343175
the surface of earth moves at a very high speed. (~ 1674 km/h)\n\n(2 * pi * 6400 km)/ 24 hours\n\nBut the atmosphere surrounding the earth also moves with same speed. So it keeps us dragging the person who jumps and make sure he falls "vertically" at the same place.\n\nIf there is no atmosphere around a planet and if you jump there from helicopter, you can feel the difference.\nOn this planet, if you jump from ground, you will move along with planet because of Newton's first law. (similar to throwing a ball up in a travelling car. the ball will travel along with car)
720016
It is not logical to think that the earth is hollow.  But the enormous pressure at the earth's center may cause the rock to be in a state that we don't understand.  It may be able to move and flow as a super dense liquid, or semi-solid gas of some sort.  \n\nGravity from an object in space is directly proportional to it's mass.  The gravity on the moon is much less than the gravity on earth because the moon is smaller, and weighs less than the earth.  \n\nThe center of gravity between the earth and moon, would be closer to the moon because the moon has less gravitational pull the farther away from the surface you go while the strength of the earth's gravity is relatively strong.\n\nThe "center" or region of space between the earth/moon system where the gravitational pull from both planets is equal, would be a far distance from the surface of the earth, and a closer distance to the surface of the moon.  \n\nAt this "center of gravity" the pull from the earth would equal the pull from the moon.  If you pass the "center" in space, the pull from the moon becomes stronger on a spaceship while the spaceship feels less effect from the weaker pull of the earth.
1064813
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
39375
The force of gravity is actually the weakest of the Fundamental Forces.  But to answer your question,  our heads don't go crashing to the floor because our bodies are sufficiently strong enough to apply enough 'upward' preassure to counter-act the Earth's gravitational attraction.  Every time you jump into the air, you're essentially escaping Earth's gravity, though it's just for a moment.  So, you can see, it doesn't take much effort for something as small as a body (or a head) to overcome gravity.
834129
You are confusing energy and gravitational force. The two are\nnot equivalent. The property of gravity is based upon the mass of an object, the more mass an object has, the more gravity it posesses. The amount of gravity an object has does not increase or decrease with time.
988087
Gravity does not travel; it is a force that varies depending mostly on the size of the bodies in question.
4566
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.
66192
It is due to the slight orbital eccentricity of Earth rotation around the Sun. Since the orbit is not perfectly circular the distance between the two bodies varies.
345655
Gravity is also like another force. it follows Newton's 3rd law. Earth attracts us and we attract Earth.\n\nBut a = f/m. Since our mass is less, we move with greater acceleration. For earth, mass is huge and the effect is negligible.
635525
Gravity is determined by only 2 things- The mass of an object, and the distance that you are from the center of that mass.  So, the increased size of a planet will put you (on the surface) farther from the center of the planet, and thus decrease the gravity-but the increased mass of the planet will cause increased gravity, and the mass is by far the stronger effect.  You have a gravity strength of 1G on the surface of the Earth, for example-but if you had a planet with the same *mass* as Earth, but the size of the moon, the gravity on the surface would be much greater, because you would be closer to the center of the planet. Just those two things-the mass of the planet, and the distance on the surface between you and the center of the planet.
309427
The gravitational attraction and earth’s rotation had made the earth’s shape into an ellipsoid of revolution.\n\nThe result is the equatorial radius of the Earth is 21.7 km more than the polar radius.\n\nSince the forces due to rotation of earth have already changed the shape, we need not take into account the rotational effect for calculating the weight. At every place on earth the force is normal to the surface.\n\nSince the polar radius is shorter than the equatorial radius g at pole is greater than at the equator.
195652
the earth is a oblate spheroid....we do not fall to the edges because of the gravitational pull...