GRAVITATION in HINDI

In this Physics video lecture in Hindi for class 9, 10, 11 and 12 we explained gravitation and force of gravity between two masses. We also discussed on the universal gravitational constant (G). The gravitational force is an attractive force. When two masses m1 and m2 are seperated by a distance r the gravitational force acting between them is equal to G X m1 X m2 / r^2. We talked about why every object we see comes downwards and not upwards.
One very interesting fact about gravitation is that if I am attracted by force F due to the earth, it is also being attracted by the same magnitude of force towards me That mean if my mass is 78 kilograms, I am being attracted towards the centre of the earth by force of magnitude 780 newton (roughly, considering the acceleration due to gravity as 10 m/s^2). In turns, this huge Earth is also being attracted by me with the force 780 newton.

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