Until about 400 years ago, study af classical mechanics was based upon philophical arguments and quantification of physical quantities and experimentation were not given much importance. At that time, Galileo performed experiments where he attempted to understand and explain phenomena with the help of numbers.
He peformed experiments with inclined planes and motion of bodies on them. He concluded, by dropping two identically shaped balls having different masses from the Leaning Tower of Pisa, that all bodies fall with the same acceleration towards the earth if air resistance is absent.
He also gave the law of inertia that is now famous as the First Law of Motion. He gave a set of mathematical transformations to relate events of different frames of reference. These transformations are classical counterparts of the Lorentz transformations used in the theory of relativity
Then came Issac Newton.
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