# NCERT Exemplar Class 11 Physics Chapter 7 Solutions: Systems of Particles and Rotational Motion

NCERT Exemplar Solutions for Class 11 Physics Chapter 7 will make you understand how to derive the equation for the centre of mass of a two-particle system. Using these equations, you can derive the equations for velocity and acceleration of the centre of mass. Other main topics of the chapter of NCERT Exemplar Class 11 Physics include torque, angular momentum, the radius of gyration, the moment of inertia, and more.

This chapter of the NCERT Exemplar Class 11 Physics book consists of 5 exemplar problems with a total of 28 questions. Solving these NCERT Exemplar Problems for Class 11 Physics will help you in clearing your concepts on the system of particles and rotational motion. Also, these solutions are based on the NCERT book topics so there is no fear of missing out on the official syllabus or studying something irrelevant.

In case of any doubts in these questions, you will not have to rush anywhere else as we have provided you with the best answers. Our subject matter experts have done thorough research on the topics to create these answers for you. Read them once and solve all your queries quickly.

## Important Topics for NCERT Physics Exemplar Solutions Class 11 Chapter 7 – Systems of Particles and Rotational Motion

**Torque**

Torque is the winding force that inclines to cause rotation. The point where the object rotates is termed as the axis of rotation. Usually, torque can be represented as T = F * r * sin (Ɵ), and it has units of Newton-meters.

**Angular Momentum**

The angular momentum of an inflexible object is termed as the product of the moment of inertia and the angular velocity. It is similar to linear momentum and is related to the fundamental restrictions of the conservation of the angular momentum principle if there is no external torque on the object.

**Radius of Gyration**

The radius of gyration is termed as the distance from the axis of rotation to a point where the total mass of the body is thought to be focused, so that the moment of inertia about the axis may remain identical. Basically, gyration is the circulation of the constituents of an object.

**Moment of Inertia **

Moment of inertia is also defined as angular mass. It is expressed as kg·m2. It is the inertia of a revolving body with respect to its rotation. It is a rotating body’s resistance to either angular acceleration or deceleration, equal to the product of the mass and the square of its perpendicular distance from the axis of rotation.

**Rotational Motion**

Rotational motion happens if every element in the body moves in a circle about a single line. This line is also known as the axis of rotation. Then the radius vectors from the axis to all the elements experience the same angular displacement at the equal time.

**Rolling Motion**

Rolling is the most common type of motion. It is combined with rotation and conversion of that body with respect to a surface, such that, if perfect conditions exist, the two are in contact with each other without slipping.

### Exercise-wise Discussion of NCERT Physics Exemplar Solutions Class 11 Chapter 7 – Systems of Particles and Rotational Motion

**Exercise 7.1 – Multiple Choice Question I**

Exercise 7.1 of Chapter 7 – Systems of Particles and Rotational Motion consists of a total of 8 multiple-choice questions. Practising these questions will help you clear your concepts on how to derive the equation for the centre of mass of a two-particle system.

**Exercise 7.2 – Multiple Choice Question II**

This exercise consists of a total of 5 questions based on the main topics of the chapter including torque, angular momentum, the radius of gyration, the moment of inertia, and more

**Exercise 7.3 – Very Short Answer Types Questions**

**NCERT Exemplar Problems for CBSE Class 11** Physics Chapter 7 Exercise 7.3 contains 5 short answer type questions. Practice well to clear your concepts.

**Exercise 7.4 – Short Answer Types Questions**

There are a total of 5 NCERT Exemplar problems in this exercise of Chapter 7. Solving the questions of this exercise will help you understand how clear your concepts are.

**Exercise 7.5 – Long Answer Types Questions**

It contains a total of 5 long answer type exemplar problems. They are long answer type questions where you will find detailed solutions to the problems.

## Why Use NCERT Physics Exemplar Solutions Class 11 Chapter 7 – Systems of Particles and Rotational Motion by Instasolv?

- Exercise-wise solutions are provided for Chapter 7 – Systems of Particles and Rotational Motion.
- NCERT Exemplar Class 11 Physics Problems and Solutions are given in easy steps so that you can easily understand them.
- You can access these solutions for free and clear any doubts directly.
- The detailed explanation will help you to develop problem-solving skills and help them to learn concepts more efficiently.
- All the questions are solved in the simplest method.
- Examples are also given to help you understand the questions and solutions in a better way.