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Gravity is really an unknown force We can define it as a field of influence and that it effects the entire existence of the universe Some people think that gravity consists of particles called gravitons which travel at the speed of light The only thing we do know is how gravity operates in different parts of our universe Without gravity there would be no space and time There is a legend that says that Galileo once dropped two objects off the Leaning Tower of Pisa to show that the heavier of the two objects dropped faster If a feather and hammer were the two objects he used then obviously the hammer would hit the ground first This is due to air resistance which is the force air exerts on a moving object This force acts in the opposite direction to that of the objects motion In the case of a falling object air resistance pushes up as gravity pulls down which causes the object to slow down When Galileos experiment was repeated on the moon the hammer and the feather hit the ground at the exact same time This is due to the fact that the moon has no atmosphere Therefore air resistance doesnt exist on the moon Also the amount of air resistance on an object depends on the speed size shape and density of the object The larger the surface area of the object the greater the amount of air resistance on it This is why feathers leaves and sheets of paper fall more slowly than pennies acorns and crumpled balls of paper There is another legend that states that when Newton was lying against a tree in an orchard he was struck on the head by an apple He wondered what provided the acceleration for the apple to fall to the ground Was this a force of the earth on the apple If so then the
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