Gravitation Class 9
Universal law of Gravitation

00:00 Explanation of gravitational force between objects with mass and its significance.
05:40 Discovery of gravitational force by Sir Isaac Newton through observation of falling apple and moon's orbit.
10:37 Explanation of gravitational constant and its independence from medium, size, and shape of objects.
16:04 Earth's gravitational force dominates objects, preventing them from moving towards each other due to its weak attraction.

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This video includes gravitation chapter of class 9 , gravitational force is explained, universal law of gravitation is explained, why earth revolve around sun, why moon revolve around earth, reason for tides , gravitational constant