 # NCERT Solutions for Class 9 Science Chapter 11

## NCERT Solutions for Class 9 Science Chapter 11 - Work and Energy

Vedantu.com - No.1 online tutoring company in India provides you the Free PDF download of NCERT Solutions for Class 9 Science (Physics) Chapter 11 - Work and Energy solved by Expert Teachers as per NCERT (CBSE) Book guidelines. All Chapter 11 - Work and Energy Exercise Questions with Solutions to help you to revise complete Syllabus and Score More marks. Register Online for Class 9 Science tuition on Vedantu.com to score more marks in your examination. Vedantu is a platform that provides free NCERT Solutions and other study materials for students. Maths Students who are looking for better solutions ,They can download Class 9 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

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:

• Word done

• Energy

• Kinetic energy

• Work energy theorem

• Factors affecting kinetic energy

• Potential energy

• Law of conservation of energy

• Power

• 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.

Do you wish to have an edge over others?