Class 11 Physics Gravitation Introduction

Introduction

  • Whenever we throw an object towards the sky it will fall back onto the ground.
  • For Example: - A ball comes down when thrown up. Rain drops fall towards the ground; Planets revolve in an elliptical orbit around sunetc.

 

Planets revolving in the elliptical orbit.

 

          

Rain drops falling on the earth.

 

 

Leaves fall off the tree.

  • There is a force due to which all things are attracted towards the earth. This force is known as Gravitation.
  • Gravitation is the force of attractionbetween all masses in the universe, especially the force of attraction exerted by the earth on all the bodies near its surface.
  • In this chapter we will take a look at gravitation force, its laws, and we will also study about the planetary motion.

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