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NCERT Solutions Class 9 Science - Chapter 10 Work and Energy - PDF Download

JEE Mains & Advanced

NCERT solutions for class 9 science, chapter 10, Work and Energy provide students with a solid basis to prepare for their CBSE exams. Regular users of NCERT solutions gain the benefit of a comprehensive methodology, which will help them to achieve high marks in their exams.

All NCERT class 9 solutions for work and energy enable students to practice and gain greater assurance in their preparations. Our team of subject experts have carefully prepared the solutions, which include objectives, diagram-based explanations and short and long type questions that can be used for both CBSE and other competitive exams.

NCERT class 9 chapter 10 science solution pdf has been made easy for the students. Each topic and subtopic has been thoroughly explained to the students so that they can understand it clearly. You can find the pdf of these explanations on eSaral. These solutions are a one stop guide for the students to prepare for their exams with ease.

Now, refer to these solutions to get deep knowledge on the important topics of Work and energy to ace your exams easily. NCERT class 9 science solution pdf is available on eSaral, which is a platform for providing free NCERT solutions and other study materials to students. 

NCERT Solutions for Class 9 Science Chapter 10 Topics

Section Name

Topic Name


Work and Energy






Rate of Doing Work

10.1 Work: The process of work is defined as the movement of energy that results from the application of a force to an object and the displacement of the object in the path of the force.

Subtopics covered in the section 10.1 Work: 

      10.1.1 Not Much ‘Work’ in Spite of Working Hard!

      10.1.2 scientific conception of work

      10.1.3 work done by a constant force

10.2 Energy: Energy is the fundamental unit of measure that describes a system’s capacity to perform a task or effect a change. Energy is a scalar unit of measure, that is, it has a dimension but it doesn’t have a direction. Energy is made up of many different elements and is always stored. Energy cannot be produced or destroyed. It can only be converted from one energy state to another.

Subtopics covered in the section 10.2 Energy: 

        10.2.1 Forms of Energy

        10.2.2 Kinetic Energy

        10.2.3 Potential Energy

        10.2.4 Potential Energy of an object at a height

        10.2.5 Are various energy forms interconvertible

        10.2.6 law of conswervation of energy

10.3 Rate of Doing Work: The speed at which work is performed is referred to as power. Power refers to the rate at which energy is converted or transformed, or the speed at which work occurs. Power plays an important role in many areas of science, engineering, and in everyday life. For instance, in the case of motors and engines, power describes the rate at which the energy is converted into work. In the case of electrical systems, power refers to the speed at which the electrical energy is used or produced. In the context of physics, power is frequently used to describe the speed at which mechanical work occurs on an object.

Key Features of Class 9 Science Chapter 10

  • Work is the process of transferring energy from one thing to another. When a force is used and displacement is caused, the amount of work that's done depends on the size of the force and how far the object is moved away from the force. 

  • Work is a quantity that has size but no direction, and it's measured in units of joules. It can be positive or negative, with positive work being when the force is in one direction and displacement in the other. Negative work is when energy is being moved away from the system, with negative work being when it's in the opposite direction. 

  • The Work-Energy theorem shows that the amount of work is the same as the change in the kinetic energy of the object.

  • The capacity to do work is a property of an object or system that allows it to make changes or carry out tasks. Energy conservation laws say that energy can't be created or destroyed. The total amount of energy in a closed system stays the same. 

  • Energy can come in many forms, such as kinetic energy, energy potential (gravitational energy, etc.), energy from chemical reactions, energy from electromagnetic radiation, and so on.

  • Energy is a quantity that can be converted from one form of energy to another. It can be measured in terms of joules. For example, when an object falls, it can be converted into a quantity of energy.

Benefits of Downloading the PDF of NCERT Solutions Class 9 Science Chapter 10 Work and Energy by eSaral

Access to comprehensive solutions: The PDF is likely to offer detailed and comprehensive solutions for the questions and problems in the textbook. This will help you to gain a better understanding of the concepts and solve problems efficiently.

Structured learning: The solutions are typically structured in a way that makes it easy for you to follow the explanations step by step. This structured approach helps you to build a solid foundation in your subject.

Clarity of concepts: The well-prepared solutions will give you a clear explanation of the concepts in the chapter. The clarity of the solutions will help you to grasp difficult topics related to work or energy.

Practice and revision: With the PDF, you can practice and revise your material at your own speed. You can review the solutions as often as you need to strengthen your understanding.

Time management: With well-prepared solutions, you can save time by providing short explanations and solutions for problem solving. This is especially useful when you need to prepare for exams or have multiple chapters to cover.

Preparing for exams: The solutions provided by NCERT are well-aligned with the syllabus and exam formats. Studying them will help you prepare for your exams efficiently and perform better.

Higher performance: With a good understanding of concepts and problem solving techniques in the solutions, you will be able to perform better in your assignments, tests and exams.

Frequently Asked Questions

Question 1: What is the law of conservation of energy?

Answer 1: The conservation of energy law states that the energy cannot be produced or destroyed, it can only be converted from one form into another. The total amount of energy stored in a closed system does not change.

Question 2: What is work in physics?

Answer 2: In the world of physics, work is the process of transferring energy when a force moves an object in its direction.


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