Can Anyone give me a short note on GRAVITATION CHAPTER OF CLASS 11 I WILL GIVE U 50Points not now but from another question please help me...
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• Kepler’s Laws of Planetary Motion
Johannes Kepler formulated three laws which describe planetary motion. They are as follows:
(i) Law of orbits. Each planet revolves around the sun in an elliptical orbit with the sun at one of the foci of the ellipse.
(ii) Law of areas. The speed of planet varies in such a way that the radius, vector drawn from the sun to planet sweeps out equal areas in equal times.
• Newton’s Law of Gravitation
Newton’s law of gravitation states that every particle in the universe attracts every other particle with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The direction of the force is along the line joining the particles.
• Universal constant of gravitation G is numerically equal to the force of attraction between two particles of unit mass each separated by unit distance.
• Important Characteristics of Gravitational Force
(i) Gravitational force between two bodies is a central force i.e., it acts along the line joining the centres of the two interacting bodies.
(ii) Gravitational force between two bodies is independent of the nature of the intervening medium.
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