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# NCERT Solutions Class 11 Physics Chapter 6 System Of Particles And Rotational Motion - PDF Download

Class 11 NCERT solutions for class 11th are important study materials that will help students understand the topic more deeply, thereby guiding them to score well in the Class 11 exam and other entrance examinations. These solutions consist of answers to all the questions present in your NCERT textbook. Students who are not able to understand the concepts during class hours can get their doubts clarified using these solutions from eSaral.

In this chapter, you will understand the motion of extended bodies, i.e., a system of particles. We shall consider the motion of a system as a whole. The main concept of this chapter is here would be the center of mass of a system of particles.we will learn its motion and its usefulness as per the Syllabus 2023-24. You can now download the answers of the NCERT Solutions for Class 11 Physics from the link available here on our website.

## Topics of NCERT Solutions for Class 11 Physics Chapter 6

Chapter  6 of NCERT Solutions provides students with a brief idea of rotational motion. All the important terms, formulas for numericals and minute concepts are covered to help students ace the examination. Some of the important topics of NCERT Solutions for Class 11 Physics Chapter 6 are

6.1 Introduction

6.1.1 What kind of motion can a rigid body have?

6.2 Center of Mass

6.3 Motion of Center of Mass

6.4 Linear Momentum of a System of Particles

6.5 Vector Product of Two Vectors

6.6 Angular Velocity And Its Relation With Linear Velocity

6.6.1 Angular Acceleration

6.6 Torque And Angular Momentum

6.6.1 Moment of force (Torque)

6.6.2 Angular momentum of a particle

6.8 Equilibrium of a Rigid Body

6.8.1 Principle of moments

6.8.2 Centre of gravity

6.9 Moment of Inertia

6.10 Theorems of Perpendicular And Parallel Axes

6.10.1 Theorem of parallel axes

6.11 Kinematics of Rotational Motion About a Fixed Axis

6.12 Dynamics of Rotational Motion About a Fixed Axis

6.13 Angular Momentum In Case of Rotational About a Fixed Axis

6.13.1 Conservation of angular momentum

## Most Important Topics-

### Introduction

In this chapter we will study the system of particles and its rotational motion. We will try to build an understanding of the motion of extended bodies. An extended body is a system of particles. We shall start with the consideration of motion of the system as a whole. The center of mass of a system of particles will be a main concept in this chapter. We will discuss the motion of the centre of mass of a system of particles and the usefulness of this concept in understanding the motion of extended bodies.

### What Kind of Motion Can A Rigid Body Have?

In this chapter we will learn about motion of rigid bodies. What is the motion of any rigid body? This is explained in this topic with various examples so that you will clear your doubts.

In rotation of a rigid body about a fixed axis,every particle of the body moves in a circle or in circular motion, which lies in a plane perpendicular to the axis and has its centre on the axis.

The motion of a rigid body which is not fixed in some way is either a pure translation or a combination of translation and rotation. The motion of a rigid body which is fixed in some way is rotation.

### Centre of Mass

In this topic we will discuss the centre of mass which is very important for this chapter. The particular point of the body where all the mass of the body is supposed to be contained and the body moves such that all the external force acts at this point, is known as the center of mass of the body.

This topic is discussed with various example which explain in proper way so that any student can understand this topic easily.

### Motion of Centre of Mass

The centre of mass of a system of particles moves as if all the mass of the system was concentrated at the centre of mass and all the external forces were applied at that particular point.

### Linear Momentum of a System of Particles

Linear Momentum of a System of Particles. Linear momentum is a product of the mass (m) of an object and the velocity (v) of the object. If an object or body has higher momentum, then it is harder to stop it.

The formula for linear momentum is p = mv.

### Vector Product of Two Vectors

Vector product means that it is the cross product of any two vectors. If you have two vectors  ‘a’ and ‘b’ then the vector product of ‘a’ and ‘b’ is ‘c’.

So this a × b actually means that the magnitude of c = ab sinθ where θ is the angle between ‘a’ and ‘b’ and the direction of ‘c’ is perpendicular to a as well as b.

### Angular Velocity And Its Relation With Linear Velocity

Angular Velocity: A relation by which the position of one line with the other line is established, is known as angular position. And the rate at which the angular position of a rotating body changes is known as angular velocity.

Linear Velocity: Linear Velocity refers to the velocity of an object or a body in a straight line. That is to say, it shows the time taken by an object for moving from point A to point B.

### Angular Acceleration

Angular acceleration of an object undergoing circular motion is known  as the rate with which its angular velocity changes with time. Angular acceleration is also referred to as rotational acceleration and it is a vector quantity, that is, it has both magnitude and direction.

### Torque And Angular Momentum

The turning effect of a force is called Torque. The angular momentum of the body is defined as the moment of momentum about the axis of rotation. The relation between Torque & angular momentum is L=ατω

## Key Features of NCERT Solutions for Class 11 Physics Chapter 6

The NCERT Physics Class 11 Chapter 6 solutions will help all the students to learn about the chapter thoroughly. Our expert teachers have made sure that the answers are adequately explained and are crisp so that the students can understand it without any help.

• The NCERT solution of Chapter 6 Physics Class 11 covers all the crucial aspects of the chapter.

• The Class 11 Physics chapter 6 rotational motion NCERT solutions are mostly written in pointers and to the point so that you can get good marks in the exam.

• The Class 11th Physics Chapter 6 solutions will help you to a great extent to prepare for their exam.

• Students can revise the Physics Class 11 System of Particles and Rotational Motion solutions before appearing for the exams.

• You can download the System of Particles and Rotational Motion Class 11 NCERT solutions pdf easily in just a few clicks.

• You can employ these NCERT solutions for the Class 11 Physics system of particles to understand the entire chapter easily.

## Benefits of NCERT Solutions for Class 11 Physics Chapter 6

NCERT solutions for Class 11 Physics Chapter 6 System of Particles and Rotational Motion,  have been able to help you in many ways.

Following are some of the benefits of NCERT Solutions of Work, Energy and Power Class 11th

• Provides Step-by-Step Solutions: Physics NCERT solutions Class 11 System of Particles and Rotational Motion, step-by-step solutions to complex problems which are essential for your class tests and final examinations. This solution covers the entire exercise given in your book.

• Quality of Answers: Class 11 Physics Chapter 6 System of Particles and Rotational Motion,  NCERT solutions are prepared by our expert teachers abiding by all the instructions given by your examination. Every answer is uniquely designed to cover each topic, explaining to you all the important concepts along with illustrations when necessary.

• Available for Free: You can access theSystem of Particles and Rotational Motion, Class 11 NCERT solutions without paying any charges because it is free of cost on our website.

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• Requires Less and Qualitative Time to Prepare: NCERT solutions Physics Class 11 Chapter 6 will help you to grasp the complex topics like power, collisions, potential energy quicker by providing well-structured answers.

Question 1 : What are the topics in chapter 6 class 11th?

Answer : Here are the topics of NCERT Solutions for Class 11 Physics Chapter 6 are

6.1 Introduction

6.1.1 What kind of motion can a rigid body have?

6.2 Center of Mass

6.3 Motion of Center of Mass

6.4 Linear Momentum of a System of Particles

6.5 Vector Product of Two Vectors

6.6 Angular Velocity And Its Relation With Linear Velocity

6.6.1 Angular acceleration

6.6 Torque And Angular Momentum

6.6.1 Moment of force (Torque)

6.6.2 Angular momentum of a particle

6.8 Equilibrium of a Rigid Body

6.8.1 Principle of moments

6.8.2 Centre of gravity

6.9 Moment of Inertia

6.10 Theorems of Perpendicular And Parallel Axes

6.10.1 Theorem of parallel axes

6.11 Kinematics of Rotational Motion About a Fixed Axis

6.12 Dynamics of Rotational Motion About a Fixed Axis

6.13 Angular Momentum In Case of Rotational About a Fixed Axis

6.13.1 Conservation of angular momentum