Best Physics GRAVITATION Notes Class 9 Summarised Chapter Revision
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Physics
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PHYSICS
GRAVITATION
Centripetal Force
• A force that acts on a body moving in a circular path and is directed towards the centre around which the body is
moving.
• Motion of the moon around the Earth and Motion of Planets around the Sun is due to centripetal force.
Universal Law of Gravitation
• Every object in this universe attracts every other object with a force which is directly proportional to the product of
their masses and inversely proportional to the square of distance between them.
m1m2
F=G
r2
• “G” is called the Universal Gravitational Constant.
• G = 6.67 x 10-11 Nm2/kg2
Importance of Universal Law of Gravitation
1. Gravitational Force binds us to the earth.
2. It is the reason for the motion of the moon around the earth and planets around the sun.
3. It causes tides due to the moon and the Sun.
Free Fall
• Whenever objects fall towards the earth under gravitational force alone, we say that the objects are in free fall.
• The acceleration of an object under free fall is called acceleration due to gravity.
• The acceleration due to gravity is denoted by “g”.
• Value of g = 9.8 m/s2
• Value of “g” is independent of the mass of the object.
Variation of g
• The value of “g” increases as we move from equator to poles.
• The value of “g” decreases as we move above the surface of the earth.
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