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Introduction Gravity is a force of attraction that exists between any two masses any two bodies any two particles Gravity is not just the attraction between objects and the Earth It is the attraction that exists between all objects NASA gravity 2000 Gravity is a very essential part of life on earth We are in the exact position in the suns gravitational field to keep us in orbit and keep life ongoing on our planet Gravity is a downward force on any body of mass the larger the mass of the body the stronger the gravitational force On earth the force is 98 NKg Newtons per Kilogram roughly depending on where you are on earth Gravitation The original idea of gravity was discovered by Sir Isaac Newton Jacob 1999 It is said that Newton was sitting under an apple tree and an apple fell from the tree striking him on the head What probably happened was that he watched an apple fall from a tree He concluded that there must be a force pulling all objects towards the ground such as the apple and himself and because the apple started at rest there must be acceleration due to that force Later with his invention of the telescope he discovered that larger bodies have a stronger gravitational pull It had been previously proven that the earth and other planets orbited around the sun Because the sun was the largest body in the solar system Newton concluded that larger bodies had larger and stronger gravitational fields As seen above gravity is a force affecting 2 bodies This is not totally exact because it does not factor in air resistance and friction Even though gravitational acceleration is constant air resistance affects free fall For instance if you took a sky diver and a ball of lead that weighed the same and dropped them from an airplane at the same time the sky diver could spread his
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