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Gravitation | CBSE Class 9 Science
Hello students, here in this video, we are going to study the topic like gravitation, gravitational force, gravity, the law of gravity, the universal law of gravitation from chapter 10 Gravitation from CBSE class 9 Science.
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Gravitation is the force of attraction between two objects in the universe. Gravitation may be the attraction of objects by the earth.
This force is proportional to the product of masses of the objects and inversely proportional
to the square of the distance between them. It is independent of the medium.
Gravity is one of the most basic forces in the universe. It plays a fundamental role not only in the structure of our solar system but also in the way objects behave on Earth.
Eg:- If a body is dropped from a certain height, it falls downwards due to earth’s gravity. If a body is thrown upwards, it reaches a certain height and then falls downwards due to the earth’s gravity.
Gravitation may be the attraction between objects in outer space.
Eg:- Attraction between the earth and moon.
The attraction between the sun and the planets.
Universal law of gravitation:
The universal law of gravitation states that ‘Every object in the universe attracts every other object with a force which is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.’
The strength of the gravitational attraction between two objects depends on two factors:
1. How big the objects are (how much mass they have) and
2. How far apart they are.
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