CBSE Class 9 Science
Revision Notes
CHAPTER – 10
GRAVITATION
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.
Gravitation
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 medium.
Gravitational force
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.
Attraction between the sun and planets.
GRAVITY
A natural force that pulls all objects toward the center of the earth
keeps the moon orbiting
It holds stars together . . .
And binds galaxies together for billions of years ….Prevents Planets from losing their
atmospheres.
2.Universal law of gravitation:
Material downloaded from myCBSEguide.com. 1/4
Revision Notes
CHAPTER – 10
GRAVITATION
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.
Gravitation
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 medium.
Gravitational force
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.
Attraction between the sun and planets.
GRAVITY
A natural force that pulls all objects toward the center of the earth
keeps the moon orbiting
It holds stars together . . .
And binds galaxies together for billions of years ….Prevents Planets from losing their
atmospheres.
2.Universal law of gravitation:
Material downloaded from myCBSEguide.com. 1/4
