NCERT Solutions for Class 9 Science Chapter 11: The CBSE Class 9 Chapter 11 deals with the topic “Work and Energy”. The CBSE NCERT Solutions for Class 9 Science Chapter 11 are created and curated by a team of academic experts at Embibe. All CBSE Class 9 students are advised to go through the NCERT books and solutions to score good marks in the annual exams. It is advisable that students practice all the questions related to Work and Energy thoroughly.
Solving the NCERT Class 9 Science Solutions for Chapter 11 helps students set a good foundation for their exam preparation. A strong foundation since Class 11 will play an important role in easing the preparation for Class 12 board exams. Each question is explained as per the latest CBSE NCERT guidelines. In the article below, students will get the solved Class 9 NCERT Solutions Chapter 11 that will help them with their preparation.
NCERT Solutions for Class 9 Science Chapter 11: Overview
Chapter 11 of Class 9 Science will help students understand the phenomenon called ‘Work’ and its closely related topics, namely energy and power. Students will then learn about the Scientific Conception of Work and the influence of Constant Force on it. The concept of Energy will follow this; wherein the students will study different forms of Energy – Potential Energy & Kinetic Energy.
Later, the concepts of 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. The chapter has various numerical problems that can be extremely useful for exam preparation.
Work and Energy is an important topic that offers a fundamental foundation for 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, students are advised to first go through all the topics and sub-topics of Class 9 Chapter 11 from the table below.
Not Much ‘Work’ in Spite of Working Hard!
Scientific Concept of Work
Work Done by a Constant Force
Forms of Energy
Potential Energy of an Object at a Height
Are Various Forms of Energy Interconvertible
Law of Conservation of Energy
Rate of Doing Work
Commercial Unit of Energy
NCERT Solutions for Class 9 Science Chapter 11: Free PDFs
NCERT Class 9 Science Chapter 11 contains 5 exercises based on various concepts studied throughout the chapter. Students can download the NCERT Solutions for Class 9 Science Chapter 11 PDF to study offline. They can also refer to the solved PDFs below for reference.
NCERT Solutions for Class 9 Chapter 11: Solved Questions
Q.1. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’. Suma is swimming in a pond. Solution: Suma applies a force while swimming to push the water backwards. Therefore, Suma swims in the forward direction caused by the forward reaction of water. Here, the force causes a displacement. Hence, work is done by Suma while swimming. Q.2. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’. A donkey is carrying a load on its back. Solution: While carrying a load, the donkey has to apply a force in the upward direction. But, displacement of the load is in the forward direction. Since displacement is perpendicular to force, the work done is zero. Thus, no work is done.
CBSE Class 9 Science Chapter 11 Work: Important Questions
Below we have provided some of the important questions for Class 9 Science Chapter 11. We recommend students to solve these questions to gain confidence to score high marks in the final exam.
1 Mark Important Questions
If a bulb consumes 2000 J of electrical energy in 20 s. Calculate its power.
What is the S.I. unit of power?
If the body starts from rest, will the change in its kinetic energy be?
What will be the equation of Work Done if the force is applied at an angle θ?
2 Mark Important Questions
What is Work and Energy?
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 displacement. What is the work done in this case?
Define Kinetic and Potential Energy.
What is Power? Write its expression.
3. Mark Important Questions
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?
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 halfway down.
What is the work done by the force of gravity on a satellite moving around the earth? Justify your answer.
Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Now that we have provided all the required information about Class 9 Science Chapter 11, Work and Energy, we advise students to start preparing for their exams by practising the important questions. Students can also take a free Work and Energy mock test at Embibe. They can solve practice questions to understand all concepts thoroughly and reinforce their learning. Additionally, they can download the subject-wise NCERT Class 9 textbooks at Embibe for free.
FAQs on NCERT Solutions for Class 9 Science Chapter 11
Q.1: Can students access NCERT Solutions for Class 9 Science Chapter 11 available in PDF? Ans: Yes, students can access the CBSE NCERT Solutions for Class 9 Science Chapter 11 in PDF format. Students can download the PDF from this article itself and study offline.
Q.2: Are NCERT textbooks enough for Class 9 Science board exams? Ans: Yes. The NCERT books are sufficient for Class 9 Science exams. These textbooks help students to develop a sound understanding of all the concepts.
Q.3: What are the topics covered under the CBSE Class 9 Science Chapter 11? Ans: The topics covered under the CBSE Class 9 Science Chapter 11 are as follows: – 11.1: Work – 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: Energy – 11.2.1: Forms of Energy – 11.2.2: Kinetic Energy – 11.2.3: Potential 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
Q.4: Where can students find the best NCERT Solutions for Class 9 Science Chapter 11? Ans: Embibe provides the best NCERT Solutions for students studying in CBSE Class 9. These solutions are prepared by Embibe’s academic experts in an easy-to-understand language.
Q.5: How can students score good marks by using NCERT Solutions for Class 9 Science Chapter 11? Ans: Students can gain thorough knowledge regarding all the new concepts of the chapter. It will also help the students solve in-text questions and exercises in the chapter. NCERT Solutions for Class 9 Science Chapter 11 will help them solve all their academic doubts and enhance their confidence.