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NCERT Solutions for Class 9 Science Chapter 11 Work and Energy: If you are a Class 9 student seeking NCERT solutions for work and energy class 9, you have come to the right place. On this page, you will find the complete NCERT solutions for this chapter, available to you free of cost. The experts at Careers360 have meticulously created these solutions in a step-by-step and easy-to-understand language. This CBSE NCERT solutions for Class 9 Science chapter 11 Work and Energy covers all the exercise questions, including additional exercises, with proper diagrams to aid comprehension. In addition to Science, you can also access NCERT Solutions for Class 9 Maths, which will further enhance your clarity in solving questions.
These class 9 chapter 11 science will give you a better understanding of concepts present in this chapter through various real-life examples, such as, when a person is holding a bucket of water for ten minutes, we can say, he is physically doing work but according to Physics he is not doing work because bucket has no displacement. work and energy class 9 pdf will clear your concept of work in Physics with a condition to say that a work has been done by a force. The solutions will provide you with an overview of the complete chapter and NCERT solutions can help you walk through other chapters and other subjects also if you wish to study.
The work and energy class 9 questions and answers are prepared with the latest NCERT syllabus. These resources can be downloaded in PDF format, allowing students to access them at their convenience. Class 9 science chapter 11 question answer is particularly helpful for students who prefer to study offline or want to print out the material for future reference.
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This chapter has been renumbered as Chapter 10 in accordance with the CBSE Syllabus 2023–24.
Topic 11.1 Work
Answer:
The work done is given by :
or
Thus the work done by the force is 56 J.
NCERT Solutions for Class 9 Science Chapter 11 Work and Energy
Topic11.1.3 Work done by a constant force
Q1 . When do we say that work is done?
Answer:
The work is done when an applied force causes some displacement. Further, if the direction of the displacement is in the direction of the force then work done by that force is positive and if the displacement is in the opposite direction then the work done is negative.
Answer:
The force is acting in the direction of displacement so the work done by the force is positive.
The work done is given by :
( Here s is the displacement.)
Q3. Define of work.
Answer:
1 J of work is defined as the 1 m displacement of a body due to the 1 N of force.
Answer:
T he work done is given by :
or
Hence the work done in ploughing the field is 2100 J.
Class 9 Science Chapter 11 Work and Energy Question Answer: Topic 11.2 Energy
Q1. What is the kinetic energy of an object?
Answer:
The energy of a particle which is due to its motion is the kinetic energy.
It is given by :
Here, m is the mass of the particle and v is the velocity.
Q2. Write an expression for the kinetic energy of an object.
Answer:
The kinetic energy of a body is given by :
Here m is the mass of the body and v is the velocity.
What will be its kinetic energy when its velocity is increased three times?
Answer:
Using the formula for the kinetic energy we have :
or
or
(i) Kinetic energy when velocity is doubled :
(ii) Kinetic energy when velocity is tripled :
Class 9 Science Chapter 11 Exercise Question Answer: Topic 11.3 (Rate of doing work)
Q1. What is power?
Answer:
Power is defined as the rate of doing work. Mathematically, it is given by :
The SI unit of power is a watt.
Answer:
1 Watt of power is defined as the 1 joule of work is done in 1 sec.
Q3. A lamp consumes 1000 J of electrical energy in 10 s . What is its power?
Answer:
The power is given by :
Thus power is 100 watt.
Answer:
Average power is defined as the total work done in a particular time period divided by the time period.
• Suma is swimming in a pond.
• A donkey is carrying a load on its back.
• A wind-mill is lifting water from a well.
• A green plant is carrying out photosynthesis.
• An engine is pulling a train.
• Food grains are getting dried in the sun.
• A sailboat is moving due to wind energy
Answer:
(i) Work done by Suma is negative as the force and displacement are in the opposite direction.
(ii) Work done is zero as the gravity on the load is acting vertically downward whereas its displacement is in a horizontal direction.
(iii) Work done is positive as both force and displacement are in an upward direction.
(iv) Work done is zero as there is no displacement involved.
(v) Work done is positive as force is acting in the direction of the motion.
(vi) Work done is zero as there is no displacement of the grains.
(vii) Work done by wind force is positive as it supports the motion of the boat.
Answer:
We can see that there is no net displacement in the vertical direction. It has only horizontal displacement. Thus work done by vertical forces on the stone will be zero.
The force of gravity is acting vertically downward, thus the work done by it is zero.
Q3. A battery lights a bulb. Describe the energy changes involved in the process.
Answer:
The chemical energy stored in a battery is transformed into the heat energy which glows the filament of the bulb. Further, the heat energy is converted into light energy.
Q4. Certain force acting on a mass changes its velocity from to . Calculate the work done by the force.
Answer:
By the equations of motion, we can write :
And the work done is :
Thus work done is - 210 J.
Answer:
The displacement of the object is horizontally on the table. We know that the gravitational force is acting in a downward direction. There is no displacement vertically.
Thus the work done by the gravitational force is zero.
Answer:
No, there is no violation of the law of conservation of energy. At the maximum height, the energy is in the form of potential energy. When the object is reaching the ground, its potential energy is decreasing whereas its kinetic energy is increasing (as the velocity of the object is increasing). Thus there is no loss of total energy (energy transformation may take place ).
Q 7. What are the various energy transformations that occur when you are riding a bicycle?
Answer:
The muscular energy of a person is transformed in the form of mechanical energy which helps to rotate the wheel of bicycles.
Answer:
Since the rock doesn't move thus net displacement is zero. As a result, the work done by the force is zero.
The energy which we apply on the rock gets transformed in the form of heat.
Answer:
We know that 1 unit of energy is given by : 1 unit = 1 KWh.
Also,
Thus 250 units in joule is given by :
Answer:
The potential energy of an object of mass m and at the height at h is given as = mgh
The potential energy of the given object is :
The potential energy is being converted into the K.E..
Thus at half-way kinetic energy of the object is :
Answer:
The work done by the gravitational force is zero. This is because the satellite is moving in a circular orbit. Thus the direction of displacement of the satellite is perpendicular to the force of gravity. Hence work done is zero.
Q12. Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
Answer:
This depends on the initial state of the object. If the object is in motion initially, then it will continue to be in this state as no external force is acting. But if the object is at rest initially then the object can't move without external force.
Answer:
Since there was no displacement thus the work done by man is zero . This work should not be considered relatable to the term 'work' we use in daily life.
Due to upholding the weight against gravity led the man to get tired.
Q14. An electric heater is rated 1500 W. How much energy does it use in 10 hours?
Answer:
The relation between energy and power is given by :
Energy = Power Time
Thus the energy used in 10 hours is :
Hence the energy used by the heater is 15 KWh.
Answer :
In the above figure, point B is the mean position about which the bob rotates.
When the bob is released from point C, it attains some velocity while moving down (up to B) and deaccelerated and stops at point A.
Thus point A and point C are the maximum height points. And the velocity of the bob at point B will be maximum.
The total energy at point A and point C is only the potential energy as its velocity at these points is zero. And at point B as the height of bob is zero thus the total energy is just the kinetic energy.
Thus in this manner, the conservation of energy takes place (by transforming in some other form.).
The eventually comes to rest due to the air resistance. It deacceleration the motion of bob. (as it is a frictional force.)
There is no violation of the energy conservation law as some amount of energy is converted in the form of heat.
Answer:
At this moment the energy of the object is :
Thus in bringing the object to rest the work needed is :
Q17. Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?
Answer:
Firstly convert the velocity in SI unit.
Thus the work done to stop the car is equal to the kinetic energy of the car.
Answer:
(i) In first case, the force acting on the object is perpendicular to the displacement of the body. Thus the work done by the force is zero.
(ii) In this, the force is in direction of the displacement so the work done is positive.
(iii) In this case, the direction of force and displacement are opposite to each other. Thus the work done by the force is negative.
Answer:
Yes. If all the external forces acting on the body balances each other then the net force acting on the object is zero. Thus the acceleration produced is zero even if forces are acting on the body. The necessary condition for the zero acceleration is that the net force acting on the body should be zero.
Q 20. Find the energy in k W h consumed in 10 hours by four devices of power 500 W each.
Answer:
The energy consumed by 1 device is given by :
Thus the energy consumed by 4 devices is
Q21. A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?
Answer:
When an object is falling from a height, there is an increase in the kinetic energy of the object. Thus just before hitting the ground the kinetic energy of the object is very high. But after hitting the ground its velocity comes to zero and thus the kinetic energy becomes zero. The kinetic energy is transformed into other forms of energy such as heat, sound or some deformation on the ground.
The solutions for chapter 11 class 9 science are provided topic by topic, beginning with work and continuing with subtopics such as work done by a constant force and energy. In addition to these topics, solved exercise questions are also included, which can provide greater clarity for students.
Furthermore, the class 9 ncert science chapter 11 solutions include important formulas, diagrams, and examples to help students apply their knowledge in problem-solving. The work energy and power class 9 solution are presented in a concise and easy-to-understand manner, making them an invaluable resource for students preparing for their class 9 science exams.
Chapter No. | Chapter Name |
Chapter 1 | Matter in Our Surroundings |
Chapter 2 | Is Matter Around Us Pure |
Chapter 3 | Atoms and Molecules |
Chapter 4 | Structure of The Atom |
Chapter 5 | The Fundamental Unit of Life |
Chapter 6 | Tissues |
Chapter 7 | Diversity in Living Organisms |
Chapter 8 | Motion |
Chapter 9 | Force and Laws of Motion |
Chapter 10 | Gravitation |
Chapter 11 | Work and Energy |
Chapter 12 | Sound |
Chapter 13 | Why Do We Fall ill? |
Chapter 14 | Natural Resources |
Chapter 15 | Improvement in Food Resources |
Formulas are essential in any chapter of a subject. They provide simple mathematical representations of concepts and relationships, making the fundamental concepts easier to understand and implement. Formulas help in solving ncert class 9 science chapter 11 exercise solutions and calculating accuracy and efficiency. Important formulas for this chapter are listed below which will help to solve work and energy class 9 numericals.
Work (W) = Force (F) × Displacement (S) × Cosθ [SI unit work= Joule(J)]
Kinetic Energy (K.E) =1/2*m*v2 [SI unit of K.E= Joule(J)]
Potential Energy (P.E) = m*g*h [SI unit of P.E= Joule(J)]
Total Mechanical Energy (TME) = Kinetic Energy (K.E) + Potential Energy (P.E)
These are some of the important formulas for work and energy class 9 chapter 11. Student can also download PDF of chapter important formula of class 9 by clicking on the below link.
Download Ebook - NCERT Class 9 Science: Chapterwise Important Formulas, Diagrams, And Point
These topics provide the basis for understanding the principles of work and energy and their application in various circumstances, opening the way for further study of physics and related fields.
Class 9 Science Chapter 11 Work and Energy Topics
Topics for ncert class 9 science chapter 11 question answer are given below:
11.1 Work
11.1.2 Scientific Conception Of Work
11.1.3 Work Done By A Constant Force
11.2 Energy
11.2.1 Forms Of Energy
11.2.4 Potential Energy Of An Object At A Height
11.2.5 Are Various Energy Forms Interconvertible?
11.2.6 Law Of Conservation Of Energy
11.3 Rate Of Doing Work
11.3.1 Commercial Unit Of Energy
When work is said to be done?
Work is said to be done when a force is applied and due to the force, the objects have a displacement.
If F is the constant force acting on the object and S is the displacement then work W= FS. The unit of work is Joule and 1 Joule= 1N m.
An important topic of NCERT Solutions for Class 9 Science Chapter 11 is :
Also Read -
Energy: Energy is the capability of doing work. The unit of energy is the same as that of energy.
Kinetic Energy: The kinetic energy of an object moving with a certain velocity is the work done on the object to acquire that velocity. Suppose initial velocity of an object is u, by applying a constant force we changed the velocity to v. Let the acceleration due to force be a and S be the displacement then work done.
This work done is known as kinetic energy
If the body starts from rest then u=0 then the kinetic energy
Potential Energy: Potential energy of an object is the energy possessed by an object due to its position. The gravitational potential energy of an object at a point above the ground is defined as the work done in raising it from the ground to that point against gravity. Suppose the mass of the object raised is m and the height to which the object is raised is h then,
Potential Energy = mgh
One of the main topics of NCERT syllabus Class 9 Science Chapter 11 Work and Energy is given below:
Work-Energy Theorem: When energy gets transformed total energy gets conserved. That is energy can neither be created nor be destroyed. For example, When we open a tape the potential energy stored in the water tank at height is converted to the kinetic energy of the water. When an electric fan is working electrical energy is converted to mechanical energy and certain energy are lost in the form of heat.
Power: The rate of doing work is Power. Power measures the speed of work done, that is, how fast or slow work is done. If an agent does a work W for time t, then power
The unit of power is watt.
Commercially electric bills are calculated in terms of unit and 1 unit= 1Kilo Watt-hour
That is if equipment with power rating 1 KW is operated for 1 hour then it consumes 1 unit of energy.
Detailed Explanations: The class 9 science chapter 11 question answer provide comprehensive and detailed explanations for all complex topics covered in the chapter. This helps students understand the concepts clearly and grasp the underlying principles.
Complete Solutions: The ncert class 9 science chapter 11 exercise solutions provide complete answers to all of the questions in the Class 9 Science NCERT textbook. This ensures that students understand the solutions and can verify their own answers.
Important Questions: The work and energy class 9 questions and answers include important questions at the end of every chapter. These questions are carefully selected to test the student's understanding and provide them with practice opportunities.
Easy Language: The language used in ncert class 9 science chapter 11 question answer is designed to be easy and simple for students to understand. This helps in the effective communication of concepts and reduces confusion.
Prepared by Subject Experts: The NCERT Solutions for Class 9 Science are prepared by the experienced faculty as per the CBSE guidelines who have conducted extensive research on every topic. This ensures that the class 9 science chapter 11 work and energy question answer provide accurate and reliable information to students.
Also Check NCERT Books and NCERT Syllabus here:
Chapter No. | Chapter Name |
Chapter 1 | Chapter 1 Matter in our Surroundings |
Chapter 2 | Chapter 2 Is Matter Around Us Pure? |
Chapter 3 | Chapter 3 Atoms and Molecules |
Chapter 4 | Chapter 4 Structure of the Atom |
Chapter 5 | Chapter 5 The Fundamental Unit of Life |
Chapter 6 | Chapter 6 Tissues |
Chapter 7 | Chapter 7 Diversity in Living Organisms |
Chapter 8 | Chapter 8 Motion |
Chapter 9 | Chapter 9 Forces and Laws of Motion |
Chapter 10 | Chapter 10 Gravitation |
Chapter 11 | Chapter 11 Work and Energy |
Chapter 12 | Chapter 12 Sound |
Chapter 13 | Chapter 13 Why do We Fall ill? |
Chapter 14 | Chapter 14 Natural Resources |
Chapter 15 | Chapter 15 Improvement in Food Resources |
The main topics covered in the NCERT syllabus of Class 9 chapter 11 are work, calculation of work, unit of work, energy, unit of energy, kinetic energy, potential energy, work energy theorem, concept of conservation of energy, power and commercial unit of energy
Yes, definitely. Almost every year there are questions from the class 9 chapters of NCERT. More than one question can be expected from the chapter Work And Energy for NSEJS. In the some of the previous year papers more than one questions were asked.
Solving the NCERT questions will give knowledge of how to apply the concepts studied to solve a numerical question and will give conceptual clarity. To solve more problems refer to NCERT Exemplar questions for Class 9 chapter 11 Work And Energy.
Yes, NCERT Solutions for Class 9 Science Chapter 11, Work and Energy, can be accessed and downloaded for free by visiting the link: NCERT Solutions for Class 9 Science Chapter 11 Work and Energy. These solutions provide comprehensive explanations and examples that can help students understand the concepts and prepare for their exams.
While NCERT Solutions for Class 9 Science Chapter 11 are a good resource for exam preparation, it is recommended that students also practice solving other reference books and previous year's question papers to get a better understanding of the concepts and exam patterns.
The field of biomedical engineering opens up a universe of expert chances. An Individual in the biomedical engineering career path work in the field of engineering as well as medicine, in order to find out solutions to common problems of the two fields. The biomedical engineering job opportunities are to collaborate with doctors and researchers to develop medical systems, equipment, or devices that can solve clinical problems. Here we will be discussing jobs after biomedical engineering, how to get a job in biomedical engineering, biomedical engineering scope, and salary.
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Data are collected and examined to respond to questions, evaluate hypotheses or contradict theories. It is a tool for analyzing, transforming, modeling, and arranging data with useful knowledge, to assist in decision-making and methods, encompassing various strategies, and is used in different fields of business, research, and social science.
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For an individual who opts for a career as an actor, the primary responsibility is to completely speak to the character he or she is playing and to persuade the crowd that the character is genuine by connecting with them and bringing them into the story. This applies to significant roles and littler parts, as all roles join to make an effective creation. Here in this article, we will discuss how to become an actor in India, actor exams, actor salary in India, and actor jobs.
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Depending on the video game designer job description and experience they may also have to lead a team and do the early testing of the game in order to suggest changes and find loopholes.
Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.
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In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.
Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.
For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.
In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.
Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.
Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.
Linguistic meaning is related to language or Linguistics which is the study of languages. A career as a linguistic meaning, a profession that is based on the scientific study of language, and it's a very broad field with many specialities. Famous linguists work in academia, researching and teaching different areas of language, such as phonetics (sounds), syntax (word order) and semantics (meaning).
Other researchers focus on specialities like computational linguistics, which seeks to better match human and computer language capacities, or applied linguistics, which is concerned with improving language education. Still, others work as language experts for the government, advertising companies, dictionary publishers and various other private enterprises. Some might work from home as freelance linguists. Philologist, phonologist, and dialectician are some of Linguist synonym. Linguists can study French, German, Italian.
The career of a travel journalist is full of passion, excitement and responsibility. Journalism as a career could be challenging at times, but if you're someone who has been genuinely enthusiastic about all this, then it is the best decision for you. Travel journalism jobs are all about insightful, artfully written, informative narratives designed to cover the travel industry. Travel Journalist is someone who explores, gathers and presents information as a news article.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.
A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
A metallurgical engineer is a professional who studies and produces materials that bring power to our world. He or she extracts metals from ores and rocks and transforms them into alloys, high-purity metals and other materials used in developing infrastructure, transportation and healthcare equipment.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack
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