NCERT Solutions for Class 9 Science Chapter 11 PDF: Work and Energy chapter deals with concepts of conservation of energy, its types, and how work & energy are interrelated. Through these solutions, we bring you the best in industry solutions for NCERT chapter 11 Class 9 science textbook questions. These solutions have been carefully curated by the best teachers at Embibe that specialize in Physics. NCERT Solutions for Class 9 Science Chapter 11 Work and Energy helps you set a good foundation for your exam preparation.
The solutions have been supported with figures so that students can get a better hold of the answers. Each question is explained as per the latest CBSE NCERT guidelines hence students can rely on them without fail. Through this article, our readers will be able to download the solutions as a pdf and get additional details on the chapter.
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NCERT Solutions For Class 9 Science Chapter 11 – Work And Energy
Work and Energy is a prominent topic that offers a fundamental foundation for all your future studies. Work and Energy are closely related terms that we use in our day to day life. Here in this topic, students learn more about force, power, energy, and how they are interlinked to each other. For effective learning, we advise you to first go through all the topics and sub-topics of Class 9 Chapter 11 from the table below.
|11.1.1||Not Much ‘Work’ in Spite of Working Hard!|
|11.1.2||Scientific Concept of Work|
|11.1.3||Work Done by a Constant Force|
|11.2.1||Forms of Energy|
|11.2.4||Potential Energy of an Object at a Height|
|11.2.5||Are Various Forms of Energy Interconvertible|
|11.2.6||Law of Conservation of Energy|
|11.3||Rate of Doing Work|
|11.3.1||Commercial Unit of Energy|
NCERT Solutions For Class 9 Science Chapter 11 – Work And Energy (Solved Exercises)
There are 5 exercises in the chapter that are based on the concepts studied throughout the chapter. We have provided the solutions to intext as well as extra questions you can download the NCERT solutions for class 9 science chapter 11 PDF to study offline.
CBSE NCERT Solutions For Class 9 Science Chapter 11 – Chapter Description
This chapter will help you understand the phenomenon called ‘Work’ and its closely related topics namely energy and power. You will then learn about the Scientific Conception of Work and the influence of Constant Force on it. This will be followed by the concept of Energy. Under this students will study different forms of Energy – Potential Energy & Kinetic Energy.
Later the concepts on the Potential Energy of an object at a height, interconversion of energy & Law of Conservation of Energy will be discussed with problems. Finally, students will learn about the Rate of Doing Work and the Commercial units of Energy. This chapter consists of plenty of numerical solutions (problems) and you will also learn about this simultaneously. Through the table given below, you can download the NCERT solutions to other chapters as well.
|NCERT Solutions for Class 9 Science Chapter 10||NCERT Solutions for Class 9 Science Chapter 12||NCERT Solutions for Class 9 Science (All Chapters)|
How To Prepare Class 9 Science Chapter 11 Work And Energy
Now that you have the NCERT solutions you can use them as reference material while preparing the chapter. Students can rely on these solutions to do their homework also. Start your preparation by reading a topic and solving all the questions related to that and then move to the next one. Since the chapter has numerical problems as well we suggest you prepare a formula sheet and practice as many numerical as you can. In the next section of this article, we have provided some important questions, go through them to improve your preparation and score better.
Class 9 Science Work And Energy Chapter 11 Important Questions
Solve these questions to clear your concepts and score high marks in the exams.
|1 Mark Important Questions|
A. If a bulb consumes 2000 J of electrical energy in 20 s. Calculate its power?
B. What is the S.I. unit of power?
C. If the body starts from rest, then change in its kinetic energy will be?
D. What will be the equation of Work Done if the force is applied at an angle θ?
|2 Mark Important Questions|
A. What is Work and Energy?
B. A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force. Let us take it that the force acts on the object through the displacement. What is the work done in this case?
C. Define Kinetic and Potential Energy.
D. What is Power. Write its expression.
|3 Mark Important Questions|
A. The kinetic energy of an object of mass, m moving with a velocity of 10m/s is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?
B. An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half way down.
C. What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
D. Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Now that you have all the study material and additional resources to kickstart your preparation. Make the best use of your time and prepare the chapter well. However, if you still face any doubt on any topic you can always learn and practice on Embibe for free. You can also take Work and Energy test from the link provided below.
We hope this article on CBSE NCERT Solutions For Class 9 Science Chapter 11 helps you. If you have any question feel free to post it here. We will get back to you at the earliest.