Gravitation for Class 9 (1)

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GRAVITATIONCLASS-9
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What is Gravitation?

• Gravitation refers to the force of attraction
  between any two objects due to their masses. This
  force of attraction can be given by universal law
  of gravitation, which states that the force of
  attraction between any two bodies is directly
  proportional to the product of their masses and
  inversely proportional to the square of the
  distance between them Force of gravitation due to
  the earth is called gravity.
• Whenever an object falls under the force of
  gravity alone, it is said to be in free fall. The
  force with which the earth attracts the object
  towards it gives the weight of the object. It is
  different from the mass of the object, which
  r refers to the total quantity of matter
  contained in the object.
• The force acting on an object perpendicular to
  the surface is called thrust. The thrust acting
  per unit area is called pressure. All fluids have
  weight, so they exert pressure on the base and
  the walls of the container in which they are
  enclosed. This pressure is transmitted
  undiminished in all directions. If an object is
  immersed in a fluid, it experiences an upward
  force called buoyant force. According to
  Archimedes Principle, this buoyant force is equal
  the weight of the fluid displaced by the object.
  The objects with density less than that of a
  liquid float and the objects with density greater
  than that of a liquid sink. Relative density,
  which is the ratio of density of a substance to
  the density of water, is a convenient way to
  compare the densities of different substances

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Extramarks Approach

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  Extramarks gives students of class 9 access to
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• For more information visit and register at
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• https//www.extramarks.com/ncert-solutions/cbse-c
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Thank You!