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# NCERT Solutions Class 9 Science - Chapter 9 Gravitation - PDF Download

NCERT solutions for class 9 science chapter 9 Gravitation provides you with all the information you need to understand the concepts related to this chapter. The detailed answers and explanations given by us in our NCERT solutions will help you to understand the concepts in a clear manner. The topic of gravitation is one of the most fascinating topics that explain everything from the stability of our planet to the reason behind the fall of objects. NCERT solutions for science chapter 9 gravitation for class 9 are written by the best teachers and industry experts who have decades of relevant experience. The solutions are updated according to the latest CBSE board prescribed content.

Gravitation is one of the most important chapters in the class 9 science syllabus. It is mandatory to study this chapter in Class 9 Science, but this time the concepts will be covered in greater depth. This chapter will cover the universal law and its explanation, formulas, exercises related to it.

To assist you in understanding the new concepts in this chapter, we have prepared NCERT solutions in pdf format for the class 9 science chapter 9. NCERT solutions for science chapter 9 is prepared by science experts of eSaral. NCERT solution for science chapter 9 has been prepared after extensive research by eSaral faculties.

## NCERT Solutions for Class 9 Science Chapter 9 Topics

 Section Name Topic Name 9 Gravitation 9.1 Gravitation 9.2 Free Fall 9.3 Mass 9.4 Weight 9.5 Thrust and Pressure 9.6 Archimedes’ Principle

9.1 Gravitation: Gravitation, also known as gravitational attraction, is the natural attraction that occurs between all objects that have mass or energy. Gravitation is one of the 4 fundamental forces of nature, and plays a vital role in celestial bodies, including planets, stars, and galaxies, as well as the entire universe. Gravitation was first proposed by Sir Isaac Newton, and later developed by Albert Einstein in his theory of general relativity.

Subtopics covered in the section 9.1 Gravitation:

9.1.1 Universal law of gravitation

9.1.2 Importance of the universal law of gravitation

9.2 Free Fall: The concept of free fall is a fundamental principle of physics, which states that an object is in free fall when it is subject to no other forces than gravity. The only force that acts on an object in free fall is gravity, which accelerates it downward. This principle is of particular importance in the study of gravitational effects on moving objects.

Subtopics covered in the section 9.2 Free Fall:

9.2.1 To calculate the value of g

9.2.2 Motion of objects under the influence of gravitational force of the earth

9.3 Mass: The quantity of matter in an object is referred to as mass. It is a fundamental characteristic of matter that determines the quantity of matter present in an object. Mass is one of the fundamental principles of physics and plays an essential role in a variety of scientific disciplines.

9.4 Weight: The concept of weight is derived from the principle of gravitation, which is the action of gravity on an object. Gravitation is the action of the Earth's gravity on an object, which in turn pulls the object downward towards the centre of the Earth, or any other large celestial body. The concept of weight is widely used in everyday life and it is essential to understand its difference from mass.

Subtopics covered in the section 9.4 Weight:

9.4.1 weight of an object on the moon

9.5 Thrust and Pressure: Thrust is a force applied to an object to push or propel it forward. Thrust is a vector quantity. This means that it has both dimension and direction.

Pressure is the force applied to a surface per unit area. It results from a distributed force applied to an area.’

Subtopics covered in the section 9.5 Thrust and Pressure:

9.5.1 Pressure in Fluids

9.5.2 Buoyancy

9.5.3 Why objects float or sink when placed on the surface of water?

9.6 Archimedes’ Principle: The Archimedes Principle is a basic principle of fluid mechanics that deals with the buoyancy force an object has when it's in a liquid or gas. It was first proposed by Archimedes, an ancient Greek physicist and mathematician, and is used a lot to explain how things move in liquids.

# Key Features of Class 9 Science Chapter 9

• The law of gravitation states that the attraction between two objects is the product of the product of their masses and the inverse of the square of the distance between the two objects. This law applies anywhere in the universe and is called universal.

• Gravitation is weak unless there are large masses involved.

• The force decreases with height. It also decreases on the earth's surface from the poles to the equator.

• Body weight is the force that the earth exerts on a body. The weight is the product of weight and acceleration due to gravity. The weight may change over time, but the mass remains constant.

• When immersed in a liquid, all objects possess a buoyancy force. Objects with a density lower than that of the fluid in which they are immersed will float on its surface.

• If the density of the object exceeds the density of the fluid it is immersed in, it will sink in the liquid.

eSaral’s PDF solutions for class 9 science chapter 9 “Gravitation” can help students to:

Complete understanding: Ensure complete understanding of the concepts of gravity by providing comprehensive and well explained answers to all questions in the textbook.

Easily access: you can easily access the solutions by downloading them on your device. You don’t need to have an internet connection to access the solutions. This is very convenient for students who are studying on the move.

Clear explanations: Clear explanations are provided for each question. This makes it easier for students to understand complex subjects related to gravity and the law of motion.

Step by step explanations: NCERT solution help students prepare for exams by providing step by step explanations and guidance on how to solve various types of questions.

Time efficiency: NCERT solution save time by allowing students to spend more time studying and practicing instead of searching for solutions elsewhere.

Question 1: What is gravitation?

Answer 1: Gravitation is a natural phenomenon that occurs between all objects that possess mass or energy. Gravitation is responsible for phenomena such as weight, planetary motion, and celestial body behavior.

Question 2: What is the difference between mass and weight?

Answer 2: Mass is the total amount of mass in an object, and it stays the same no matter where you are. Weight is the force that's applied to an object because of gravity, and it changes depending on where you are. It's proportional to the amount of mass and the acceleration that's caused by gravity.