Gravitation Class 9 CBSE Notes - Chapter 10

Gravitation Class 9 Notes explains how gravity works in intricate detail. We are aware of the fact that the earth has gravity and it keeps every object tethered to the surface. But what exactly is gravity and what are its implications?

What is Gravity?

Gravity is essentially a force which attracts a body towards to centre of another physical body having mass. Among the various fundamental forces, gravity is the weakest and its presence is almost imperceptible by us. But on an astronomical scale, it is quite a powerful force. For instance, black holes are the end stage of stars that had very large masses. These cosmic structures have gravity so strong that even light cannot escape. As a result, black holes are not visible.

Back on earth, the gravity clocks in at 9.807 m/s². This means any object free falling from a considerable height will accelerate at 9.807 m/s² until terminal velocity is reached.

Gravitation Class 9 – Questions

  1. State the universal law of gravitation.
  2. What do you understand by the term gravity?
  3. What does it mean to Free Fall?
  4. What is buoyancy?
  5. Define relative density.

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