# NCERT Class 9 Science Gravitation

Read and download NCERT Class 9 Science Gravitation in NCERT book for Class 9 Science. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Science textbook for Class 9 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 9 Science to understand the answers of the exercise questions given at the end of this chapter

## NCERT Book for Class 9 Science Chapter 10 Gravitation

Class 9 Science students should refer to the following NCERT Book Chapter 10 Gravitation in Class 9. This NCERT Book for Class 9 Science will be very useful for exams and help you to score good marks

### Chapter 10 Gravitation NCERT Book Class 9

GRAVITATION

In Chapters 8 and 9, we have learnt about the motion of objects and force as the cause of motion. We have learnt that a force is needed to change the speed or the direction of motion of an object. We always observe that an object dropped from a height falls towards the earth. We know that all the planets go around the Sun. The moon goes around the earth. In all these cases, there must be some force acting on the objects, the planets and on the moon. Isaac Newton could grasp that the same force is responsible for all these. This force is called the gravitational force. In this chapter we shall learn about gravitation and the universal law of gravitation. We shall discuss the motion of objects under the influence of gravitational force on the earth. We shall study how the weight of a body varies from place to place. We shall also discuss the conditions for objects to float in liquids.

10.1 Gravitation

We know that the moon goes around the earth. An object when thrown upwards, reaches a certain height and then falls downwards. It is said that when Newton was sitting under a tree, an apple fell on him. The fall of the apple made Newton start thinking. He thought that: if the earth can attract an apple, can it not attract the moon? Is the force the same in both cases? He conjectured that the same type of force is responsible in both the cases. He argued that at each point of its orbit, the moon falls towards the earth, instead of going off in a straight line. So, it must be attracted by the earth. But we do not really see the moon falling towards the earth.

Let us try to understand the motion of the moon by recalling activity 8.11.

Activity _____________ 10.1

• Take a piece of thread.

• Tie a small stone at one end. Hold the other end of the thread and whirl it round, as shown in Fig. 10.1.

• Note the motion of the stone.

• Again, note the direction of motion of the stone.

force, the stone flies off along a straight line. This straight line will be a tangent to the circular path.

The motion of the moon around the earth is due to the centripetal force. The centripetal force is provided by the force of attraction of the earth. If there were no such force, the moon would pursue a uniform straight line motion. It is seen that a falling apple is attracted towards the earth. Does the apple attract the earth? If so, we do not see the earth moving towards an apple. Why?

According to the third law of motion, the apple does attract the earth. But according to the second law of motion, for a given force, acceleration is inversely proportional to the mass of an object [Eq. (9.4)]. The mass of an apple is negligibly small compared to that of the earth. So, we do not see the earth moving towards the apple. Extend the same argument for why the earth does not move towards the moon.

In our solar system, all the planets go around the Sun. By arguing the same way, we can say that there exists a force between the Sun and the planets. From the above facts Newton concluded that not only does the earth attract an apple and the moon, but all objects in the universe attract each other. This force of attraction between objects is called the gravitational force.

Please refer to attached file for NCERT Class 9 Science Gravitation

 NCERT Class 9 Science Matter In Our Surroundings NCERT Class 9 Science Matter In Our Surroundings Questions
 NCERT Class 9 Science Is Matter Around Us Pure NCERT Class 9 Science Is Matter Around Us Pure Questions
 NCERT Class 9 Science Atoms And Molecules NCERT Class 9 Science Atoms And Molecules Questions
 NCERT Class 9 Science Structure Of The Atom NCERT Class 9 Science Structure Of The Atom Questions
 NCERT Class 9 Science The Fundamental Unit Of Life NCERT Class 9 Science The Fundamental Unit Of Life Questions
 NCERT Class 9 Science Tissues NCERT Class 9 Science Tissues Questions
 NCERT Class 9 Science Diversity In Living Organisms NCERT Class 9 Science Diversity In Living Organisms Questions
 NCERT Class 9 Science Motion NCERT Class 9 Science Motion Questions
 NCERT Class 9 Science Force And Laws Of Motion NCERT Class 9 Science Force And Laws Of Motion Questions
 NCERT Class 9 Science Gravitation NCERT Class 9 Science Gravitation Questions
 NCERT Class 9 Science Work And Energy NCERT Class 9 Science Work And Energy Questions
 NCERT Class 9 Science Sound NCERT Class 9 Science Sound Questions
 NCERT Class 9 Science Why Do We Fall Ill NCERT Class 9 Science Why Do We Fall Ill Questions
 NCERT Class 9 Science Natural Resources NCERT Class 9 Science Natural Resources Questions
 NCERT Class 9 Science Improvement In Food Resources NCERT Class 9 Science Improvement In Food Resources Questions
 NCERT Class 9 Science Solutions and Answers

### Science NCERT Book Class 9 Chapter 10 Gravitation

The above NCERT Books for Class 9 Science Chapter 10 Gravitation have been published by NCERT for latest academic session. The textbook by NCERT for Chapter 10 Gravitation Science Class 9 is being used by various schools and almost all education boards in India. Teachers have always recommended students to refer to Chapter 10 Gravitation NCERT etextbooks as the exams for Class 9 Science are always asked as per the syllabus defined in these ebooks. These Class 9 Chapter 10 Gravitation book for Science also includes collection of question. We have also provided NCERT solutions for Class 9 Science which have been developed by teachers of StudiesToday.com after thorough review of the latest book and based on pattern of questions in upcoming exams for Class 9 students.

### NCERT Book Class 9 Science Chapter 10 Gravitation

The latest NCERT book for Chapter 10 Gravitation pdf have been published by NCERT based on the latest research done for each topic which has to be taught to students in all classes. The books for Class 9 Science Chapter 10 Gravitation are designed to enhance the overall understanding of students. All Class 9 NCERT textbooks have been written in an easy to understand language which will help to enhance the overall level of Class 9 students.

#### Chapter 10 Gravitation NCERT Book Class 9 Science

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#### Class 9 Science Chapter 10 Gravitation NCERT Book

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#### Class 9 Chapter 10 Gravitation NCERT Book Science

For Class 9 Chapter 10 Gravitation we have provided books for students who have opted for Hindi and Urdu medium too. You can click on the links provided above to download all Hindi medium Class 9 Science Chapter 10 Gravitation book in easy to read pdf format. These books will help Class 9 Science students to understand all topics and also strictly follow latest syllabus for their studies. If you are looking to download the pdf version of Class 9 Science Chapter 10 Gravitation textbook issued by NCERT then you have come to the correct website

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