NCERT Solutions for Class 9 Physics Chapter 11 – Work and Energy
Physics is the most essential part of science whose aim is to explain the behavior of the universe. It is an important part of class 9 Science. In this NCERT Solutions for Class 9 Physics Chapter 11, we are discussing the various aspects of work and energy. We have explained each and every topic in a detailed easy language for easier understanding.
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CBSE Class 9 Physics Chapter 11 – Work and Energy NCERT Solutions
Work refers to the change in the place of an object due to the movement of push and pull. While on the other hand, energy refers to the capability of doing work.
Subtopics covered under NCERT Solutions for Class 9 Physics Chapter 11
11.1 Work
This topic discusses what work is.
11.1.1 Not Much ‘Work’ in Spite of Working Hard! – With the help of examples, this topic explains that work not only includes physical work but also include mental work.
11.1.2 Scientific Conception of Work- This topic describes the conception of science related to work.
11.1.3 Work Done by a Constant Force- This topic discusses the even force required to perform certain work.
Work done = force × displacement
W= Fs
11.2 Energy
This topic discusses what is energy and who is the biggest source of natural energy.
11.2.1 Forms of Energy- This topic describes various forms of energy divides in toe two parts kinetic and potential energy.
11.2.2 Kinetic Energy- It refers to that energy by which an object or body movement. And it explained with an example in the chapter.
11.2.3 Potential Energy- It is that energy that gets stored in an object due to the work done on an object.
11.2.4 Potential Energy of an Object at a Height- This describes that the energy stored in an object that is moving against the gravity holds gravitational potential energy. Also, it increases as the height of the object increases.
Work done = force × displacement
11.2.5 Are Various Energy Forms Interconvertible? – This topic asks the question that can energy convert from one form to another or not?
11.2.6 Law of Conservation of Energy- This topic describes the various laws of conserving energy.
Constant = potential energy+ kinetic energy
11.3 Rate of Doing Work
This topic discusses that capacity of doing work that changes from person to person.
Power = work / time
And the energy is measured in Watt. And larger energy is measured in Kilowatt
11.3.1 Commercial Unit of Energy- This topic tells about the commercial unit of energy that is Joule denoted by ‘J’.
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