Gravitation
Gravitation
Everybody in this universe
attracts each other body with a force called force of gravitation. The force of
attraction between a chair and a table lying in your classroom, the force of
attraction between you and your friend etc. are example of gravitation. Gravity
is a special case of gravitation. If one of the two attracting bodies is
comparatively very large like moon, earth or any other planet then the force of
attraction between the two bodies is called gravity. Gravitation is always
attractive in nature.
Kepler’s Laws of planetary Motion:
1. Law
of orbits (First law):
All planets revolve in elliptical orbits around the sun and the sun is situated
at one of its foci of the elliptical path.
2. Law
of area (second law): The
areal velocity of a planet remains constant, i.e., the line joining the sun to
planet covers equal areas in same interval of time.
3. Law
of periods (third law):
The Square of the period of revolution of the planet is directly proportional
to the cube of the semi major axis of its orbit.
Newton’s
Universal Law of Gravitation:
On the basis of Kepler’s laws of
planetary motion, Newton stated his famous law of gravitation. According to
this law:
Every two objects in the universe
attract each other and the force of attraction between the bodies is directly
proportional to the product of their masses and inversely proportional to the
square of the distance between them.
i.e.,
0 Comments