Class 9th Science Gravitation NCERT Notes CBSE 2023
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Gravitation Class 9 Notes

Gravitation Class 9 Notes

Chapter 10 Gravitation

NCERT Class 9 Science Chapter 10 is all about gravity. Learn the law of universal gravitation, listen to detailed explanations, and learn various formulas. This chapter also explores the basic concepts of velocity, acceleration, force, work, and energy.

NCERT Class 9 Scence notes helps students gain a deep conceptual understanding of the questions in the text. Students can also improve their preparation by practicing for free on over 3,300 questions from 82 different Vidyakul books. 

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Points to Remember

We have provided some important points from NCERT Class 9 Science Chapter 10 Gravitation that students must remember. Students can refer to the points below:

  • Every object in this universe attracts other objects with some force, which depends on the masses of the objects and the distance between them. This force is called the force of gravitation.

  • Newton’s Universal Law of Gravitation states that everybody in this universe attracts every other body with force, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. It can be formulated as F = Gm1m2/d2

  • Gravitational Constant (G) is equal to the force of attraction between two unit point masses, when they are separated by a unit distance, as measured from their centres. Its value in SI units is 6.67 × 10−11 N m2 kg−2.

  • Force of gravity is a special case of the force of gravitation when one among the two bodies has an infinitely large mass as compared to the other body.

  • The phenomena like (a) the motion of the moon around the earth, (b) the motion of planets around the Sun and the occurrence of high tide and low tide can be explained by the law of gravitation.

Students can access all important points for NCERT Class 9 Science Chapter 10 Gravitation on Vidyakul for free.

Topics and Sub-topics

In this chapter, students learn about gravity, the law of universal gravitation, the force of gravity and its importance. Later we will also discuss the concept of free fall, the value of g, and the motion of objects under the influence of Earth's gravity. Students also learn about the difference between mass and weight and how to calculate the weight of an object on the moon. 

This chapter consists of a number of problems that require diligent understanding and practice. Students can refer to the topics present in Chapter 10 Physics as mentioned below:

Sr No

Topic Name


Introduction to Gravitation


Free Fall






Thrust and Pressure


Archimedes’ Principle


Relative Density

Few Important Questions

  • What is gravity?

Gravity is a natural phenomenon by which all masses and energy are attracted to one another and to Earth.

  • What is relative density?

The ratio of the density of a substance to the density of a standard substance under specified conditions.

  • What is meant by free fall?

When an object falls under the sole influence of gravity, the object is said to be under ‘free fall’.

Learn more about the same in Gravitation Class 9 Notes pdf.

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