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NCERT CLASS IX - Science Textbook

Chapter 10 - Gravitation

Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.


F=G * M1 * M2/r2 

 where ,
    f = force of attraction
   M1 & M2 are the masses 
  G = gravitational constant 
  r = distance or radius 

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         F = G M  m  / R²

  Force F
   G = universal gravitational constant
   M = mass of Earth
   m = mass of an object on the surface of Earth
   R = radius of Earth
   g = acceleration due to gravity  = G M / R²

then  F = m g

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