**NCERT Solutions for Class 11 Physics Chapter 7 – Systems of Particles and Rotational Motion**

NCERT Solutions for Class 11 Physics will strengthen a student’s ability to grasp this chapter of Physics. Our NCERT Solutions are extremely helpful in completing the syllabus and getting a better level of understanding. NCERT Solutions for Class 11 Physics Chapter 7 Systems of Particles and Rotational Motion gives step by step solution for every question of exercise and will also help students to do their homework in an easy way.

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### CBSE Class 11 Physics Chapter 7 – System of Particles and Rotational Dynamics NCERT Solutions

NCERT Solutions for Class 11 Physics Chapter 7 Systems of Particles and Rotational Motion will provide you with the answers to the questions from the textbook. The real body which we encounter in daily life has a finite size. In dealing with the motion of extended bodies the idealized model of a particle is not sufficient.

**Subtopics covered under NCERT Solutions for Class 11 Physics Chapter 7**

- 7.1 Introduction
- 7.1.1 What Kind Of Motion Can A Rigid Body Have?
- 7.2 Centre Of Mass
- 7.3 Motion Of Centre Of Mass Centre Of Mass
- 7.4 Linear Momentum Of A System Of Particles
- 7.5 Vector Product Of Two Vectors
- 7.6 Angular Velocity And Its Relation With Linear Velocity
- 7.6.1 Angular Acceleration
- 7.7 Torque And Angular Momentum
- 7.7.1 Moment Of Force (Torque)
- 7.7.2 Angular Momentum Of A Particle
- 7.8 Equilibrium Of A Rigid Body
- 7.8.1 Principle Of Moments
- 7.8.2 Centre Of Gravity
- 7.9 Moment Of Inertia
- 7.10 Theorems Of Perpendicular And Parallel Axes
- 7.10.1 Theorem Of Parallel Axes
- 7.11 Kinematics Of Rotational Motion About A Fixed Axis
- 7.12 Dynamics Of Rotational Motion About A Fixed Axis
- 7.13 Angular Momentum In Case Of Rotation About A Fixed Axis
- 7.13.1 Conservation Of Angular Momentum
- 7.14 Rolling Motion
- 7.14.1 Kinetic Energy Of Rolling Motion

**NCERT Solutions for Class 11 Physics Chapter 7**

NCERT Solutions for Class 11 Physics Chapter 7 Systems of Particles and Rotational Motion help students to understand that a rigid body is one for which the distances between different particles of the body are fixed even force acting on them.

Let us discuss the sub-topics in detail.

**7.1: INTRODUCTION**

In this chapter, the student will learn to build an understanding of the motion of extended bodies. An extended body i.e. system of particles.

**7.1.1: What kind of motion can a rigid body have?**

The student will learn types of motion that a rigid body can have.

**7.2: CENTRE OF MASS**

This is the center of mass of the particle under motion. We can find it with different methods for different shapes.

**7.3: MOTION OF CENTRE OF MASS CENTRE OF MASS**

This explains the physical importance of the center of mass for a system of particles.

**7.4: LINEAR MOMENTUM OF A SYSTEM OF PARTICLES**

The student will learn about linear momentum of a system of a particle with its required equations.

**7.5: VECTOR PRODUCT OF TWO VECTORS**

Vector product is very important to understand for deriving the equation of motion. The student will learn it in this section.

**7.6: ANGULAR VELOCITY AND ITS RELATION WITH LINEAR VELOCITY**

The student will study what is angular velocity and its role in rotational motion.

**7.6.1: Angular acceleration**

This section defines angular acceleration as the time rate of change of angular velocity;

**7.7: TORQUE AND ANGULAR MOMENTUM**

The student will learn about two physical quantities which are defined as vector products of two vectors.

**7.7.1: Moment of force (Torque)**

This section explains about a rotational analog of force which is a moment of force. It is also known as torque or couple.

**7.7.2: Angular momentum of a particle**

Angular momentum is similar to linear momentum in rotational motion.

**7.8: EQUILIBRIUM OF A RIGID BODY**

Mechanical equilibrium for a rigid body is the state when both its linear momentum and angular momentum are not changing with time,

**7.8.1: Principle of moments**

This principle explains about balancing of moments and hence about equilibrium state.

**7.8.2: Centre of gravity:**

This section defines the center of gravity of a body as that point where the total gravitational torque on the body is zero.

**7.9: MOMENT OF INERTIA:**

It explains about the moment of inertia about a given axis of rotation resists a change in its rotational motion.

**7.10: THEOREMS OF PERPENDICULAR AND PARALLEL AXES**

These two theorems relating to the moment of inertia are important.

**7.10.1: Theorem of parallel axes**

It is applicable to a body of any shape.

**7.11: KINEMATICS OF ROTATIONAL MOTION ABOUT A FIXED AXIS**

This section is limited only to kinematics. The student will learn equations of rotational motion.

**7.12: DYNAMICS OF ROTATIONAL MOTION ABOUT A FIXED AXIS**

This section explains the dynamics of a fixed body during its rotational motion.

**7.13: ANGULAR MOMENTUM IN CASE OF ROTATION ABOUT A FIXED AXIS**

The student will study the angular momentum in the special case of rotation about a fixed axis.

**7.13.1: Conservation of angular momentum**

It explains the principle of conservation of angular momentum in the during rotation about a fixed axis.

**7.14: ROLLING MOTION**

It explains the rolling motion which all wheels are using in transportation.

**7.14.1: Kinetic Energy of Rolling Motion**

The student will study that the kinetic energy of a rolling body can be divided into kinetic energy of translation and kinetic energy of rotation.

**You can download NCERT Solutions for Class 11 Physics Chapter 7 PDF by clicking on the button below.**

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