NCERT Solutions for Class 9 Science Chapter 11
Q 1: Give a brief overview of the chapter Work and Energy.
Ans: The chapter of work and energy is substantially based on the principle which says – the kinetic energy of a body is directly proportional to the amount of work done on the body. The work done is, in turn, caused as a result of the force acting on the body. Similarly, the vice-versa also stands true – kinetic energy decreases with a decrease in force.
You will get a clear idea on these three terms – work, energy and force. A clear understanding of both potential energy and kinetic energy is essential to go deeper into the chapter where it deals mostly with kinetic energy.
Q 2: What are the main concepts that are covered in this chapter?
Ans: Initially, the chapter focuses on the work done when a force acts on a body.
Work is said to be done only in case when there is a displacement of the body on which force is being applied.
You need to multiply the force with displacement to find the amount of work done on that particular body.
The main concepts that are covered in this chapter are:
Work energy theorem
Factors affecting kinetic energy
Law of conservation of energy
The scientific conception of work
Rate of doing work
Commercial unit of energy
Q 3: How many exercise questions are there in this chapter?
Ans: There are a total of 5 exercises in this chapter.
Exercise 11.1 carries 1 question which is based on work and power
Exercise 11.2 carries 4 questions which are based on energy and units of energy.
Exercise 11.3 carries 3 questions which are based on forms of energy.
Exercise 11.4 carries 4 questions which are based on kinetic energy and its expression.
Exercise 11.5 carries 21 questions which are based on conservation of energy and potential energy and its expression.
Q 4: How will Vedantu’s NCERT solutions of class 9 science chapter 11 Work and Energy will help us?
Ans: Solutions to the exercise questions are drafted by our science experts as per the recent guidelines provided by the CBSE and NCERT. We have framed the solutions in a bit by bit manner to make your learning process and preparation simple and easy to understand. We have given all the relevant exams and diagrams to the questions with real-life examples.
Our NCERT solutions are in a structured way which helps you in building up a strong base of conceptual knowledge. We always make sure that all the main topics and sub-topics are covered from each and every chapter and we also have designed these solutions in a way to make your learning process more fun, fascinating and enjoyable.