Tudal Views Read Edit View history. For more than 30 years laser pulses have been sent from earth to the moon. Because of the negligible lunar atmosphere, there ttower no drag on the feather, which hit the ground at the same time as the hammer. Since the man, the box, the ball, the paper and the cup arjstotle falling at the same rate, the man would not think that he or any other object is moving at all- the relative velocity of these objects with respect to each other is 0. Laird — — Isis: And this is how it was done: He had, however, formulated an earlier version which predicted that bodies of the same material falling through the same medium would fall at the same speed. Antonio Banfi — — Feltrinelli Editore.
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He had, however, formulated an earlier version which predicted that bodies of the same material falling through the same medium would fall at the same speed. The two sciences were the science of motion, which became the foundation-stone of physics, and the science of materials and construction, an important contribution to engineering.
Galileo arrived at his hypothesis by a famous thought experiment outlined in his book On Motion. Drop this system of objects from the top of a tower. If we assume heavier objects do indeed fall faster than lighter ones and conversely, lighter objects fall slower , the string will soon pull taut as the lighter object retards the fall of the heavier object.
But the system considered as a whole is heavier than the heavy object alone, and therefore should fall faster. This contradiction leads one to conclude the assumption is false. Other performances[ edit ] The Nieuwe Kerk in Delft, where the experiment by Stevin and de Groot took place A similar experiment took place some years earlier in Delft in the Netherlands , when the mathematician and physicist Simon Stevin and Jan Cornets de Groot the father of Hugo de Groot conducted the experiment from the top of the Nieuwe Kerk.
This proves that Aristotle is wrong. Because of the negligible lunar atmosphere, there was no drag on the feather, which hit the ground at the same time as the hammer. See also[ edit ] Terminal velocity An object dropped through air from a sufficient height will reach a steady speed, called the terminal velocity, when the aerodynamic drag force pushing up on the body balances the gravitational force weight pulling the body down.
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