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.
Students need to have 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. To avoid any confusion, you can directly refer to our NCERT Solutions for Class 9 Science Chapter 11.
Vedantu has elaborately explained each of these terms and drawn suitable comparisons of the same to help you gain clarity. Our study materials have high-quality solutions that have step by step procedures along with an appropriate explanation for understanding each topic.
Hereunder is a brief explanation of each exercise covered in this chapter.
Intext Exercise 1
This exercise has only one question where you are asked to determine the work done. Students need to know the fundamentals of this chapter and also the parameters required to calculate the work done.
As mentioned above, you need to know about:- Unit of work in joules (J).
For clarity on formulae and their usage, you can refer to our NCERT Solutions for Class 9 Science Chapter 11. Our solutions will guide you to answer the question in a simplified manner without any confusion.
Intext Exercise 2
Under this section, four questions are there, and you have to answer them most appropriately. The question tests the basic understanding of work and force in the first question.
In the second question, you are asked to frame out a mathematical equation that manifests the work done when a force acts on a body. Students should understand that:- Work is said to be done only in case when there is a displacement of the body on which force is being applied.
In our Work and Energy Class 9 Questions and Answers offered by us, you can find appropriate explanations to these concepts. It will help you in solving questions efficiently without making any silly mistakes.
Intext Exercise 3
The three questions covered under this exercise are entirely based on kinetic energy.- The first question asks you to define the term.
To know the shortcut techniques, avail our NCERT Solutions for Class 9 Science Chapter 11 and fetch more marks in your actual exam. Besides, our notes are available online, which you can download and save it for your future reference.
With clarity in the basic concept, you will be able to answer even twisted questions, if they are asked in the exam. Hence, we recommend you to go through our solutions once and cross-check your answers.
Intext Exercise 4
For questions in total under this section, students need to calculate the work done when parameters like time and power are provided. You will find a new term ‘power’ is introduced here, but it is nothing complicated in understanding.
Refer to our NCERT Solutions for Class 9 Science Chapter 11, which will show you the following:- Power is calculated as the rate of change in work done.
For an in-depth understanding with suitable comparison, refer to our Class 9 Science Chapter 11 Question Answer and know ways to frame your answers correctly.
This exercise has the highest number of questions so far – 21 questions to be answered, which are both explanatory as well as numerical. Terms like velocity, mass are also introduced here. You need to know the following things here:- Understanding of scalar and vector quantities.
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