Question

There is a popular story that one day, when Newton was sitting under an apple tree, an apple fell on his head, and this led him to think about the force of gravitation.As in all such legends, the story is almost certainly not true in its details, but the story contains elements of what actually happened. Probably the more correct version of the story is that Newton, upon observing an apple fall from a tree, began to think along the following lines:- The falling apple is getting accelerated; there must be a force acting on the apple. If the force can reach to thetop of the highest level of tree might it not reach even further (all the way to moon!). By such reasoning, Newton came to the conclusion that any two objects, in the universe, exert gravitational attraction of each of each other. This force is directly proportional to the product of their masses and inversly proportional to square of the distance between them. The weight of an object is the measure of the gravitational force exerted on that object by the earth.
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