NCERT Solutions for Class 9 Science Chapter 11 Work and Energy
NCERT Solutions for Class 9 Science Chapter 11 Work and Energy: These solutions of NCERT Class 9 Chapter 11 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 10 minutes, we can say, he is physically doing work but according to Physics he is not doing work because bucket has no displacement. The CBSE NCERT solutions for Class 9 Science chapter 11 Work and Energy will clear your concept of work in Physics with a condition to say that a work has been done by a force. The solutions for NCERT Class 9 Science chapter 11 Work and Energy 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. Below you can check some questions and answers which will help you to clear your concepts.
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Class 9 Science Chapter 11 Work and Energy Topics
11.1.2 Scientific Conception 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 Energy Forms 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 In-text Questions-
Work And Energy Class 9 NCERT Chapter 11 Important Formulas
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, Definition And Types
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 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.
NCERT Solutions for Class 9 Science- Chapter Wise
| 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|
NCERT Solutions for Class 9 - Subject Wise
How to Use NCERT Solutions for Class 9 Science Chapter 11 Work and Energy?
- If you want to score well in your exam then the practice should be the only way which will help you to get high scores in the CBSE class 9 science exam.
- While preparing for the exam, you must go through the NCERT solutions for Class 9 science Chapter 11 Work and Energy. Since in your exams, there will be direct questions from the NCERT textbook.
- The solutions are created by experienced science faculty as per the CBSE guidelines.
Frequently Asked Question (FAQs) - NCERT Solutions for Class 9 Science Chapter 11 Work and Energy
Question: What are the main topics to be covered to understand the Work And Energy Class 9 Science chapter 11 NCERT solutions?
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
Question: Is the chapter helpful for exams like NSEJS?
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.
Question: Whay should I solve Work And Energy Class 9 NCERT Science Chapter 11 questions?
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.
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