NCERT Solutions for Class 9 Science Chapter 10 Work and Energy

NCERT Solutions for Class 9 Science Chapter 10 - Work and Energy

Vishal kumarUpdated on 16 Sep 2025, 02:06 AM IST

Have you ever seen that you feel tired when you have climbed the stairs or why a bicycle slows down when you press on the brakes? Class 9 Science Chapter 10 - Work and Energy explains these real life experiences in which the key concepts such as work, energy, power and the law of conservation of energy are discussed. The NCERT Solutions to Class 9 Chapter 10 Work and Energy Science is tailored to make it easier to study, yet with an exam-focused orientation, and is useful to CBSE board exams, school assessments, and other competitive tests such as NTSE and Olympiads.

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Class 9 Science Chapter 10 - Work and Energy Question Answers: Download PDF
Work and Energy NCERT Solutions: Solved Exercise Questions
Class 9 Science Chapter 10 - Work and Energy: Higher Order Thinking Skills (HOTS) Questions
Class 9 Science Chapter 10 - Work and Energy: Topics
Approach to Solve Questions of Class 9 Science Chapter 10 - Work and Energy
Benefits of Work and Energy NCERT Solutions
NCERT Solutions for Class 9 Science Chapter-wise

Work and Energy

In Work and Energy NCERT Solutions, answers to all 21 questions in the textbook and 5 HOTS (Higher Order Thinking Skills) problems will be given in detail so as to understand the theory as well as the numericals thoroughly. These NCERT Solutions for Class 9 Science Chapter 10 - Work and Energy are explained in a systematic manner and tackles all key concepts with clear explanations, solutions given step-by-step, solved examples and supporting diagrams. A full list of significant formulas is also provided to students in order to revise and have greater practice with numbers. The NCERT Solutions for Class 9 Science Chapter 10 - Work and Energy are prepared by faculty experts and according to the newest CBSE syllabus that enables the students develop good conceptual level of knowledge, enhance problem-solving skills and confidence when examining the syllabus.

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Class 9 Science Chapter 10 - Work and Energy Question Answers: Download PDF

The NCERT Solutions for Class 9 Science Chapter 10 - Work and Energy provide a systematic, problem-by-problem solutions to all questions in the textbook to address the vital issues like the work, energy, power, and the law of conservation of energy. These solutions are prepared by specialists in the subject according to the latest CBSE syllabus, and they assist the students in preparing exams, revising, and clarifying the concepts. They also are very helpful in CBSE board test and competitive exams such as NTSE and Olympiads with solved examples, HOTS questions and key formulas. Class 9 Science Chapter 10 - Work and Energy Solutions chapter is free and can be downloaded as a PDF file.

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Work and Energy NCERT Solutions: Solved Exercise Questions

The Work and Energy Class 9 question answers comprise well-formatted responses to all the problems in the chapter textbook covering important concepts such as work, energy, power and the law of conservation of energy. These solutions guide students to reinforce ideas and enhance precision in tests.

Q1. Look at the activities listed below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.

• Suma is swimming in a pond.

• A donkey is carrying a load on its back.

• A windmill is lifting water from a well.

• A green plant is carrying out photosynthesis.

• An engine is pulling a train.

• Food grains are getting dried in the sun.

• A sailboat is moving due to wind energy

Answer:

(i) Work done by Suma is negative as the force and displacement are in the opposite direction.

(ii) Work done is zero as the gravity on the load is acting vertically downward, whereas its displacement is in a horizontal direction.

(iii) Work done is positive as both force and displacement are in an upward direction.

(iv) Work done is zero as there is no displacement involved.

(v) Work done is positive as force is acting in the direction of the motion.

(vi) Work done is zero as there is no displacement of the grains.

(vii) Work done by wind force is positive as it supports the motion of the boat.

Q2. An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

Answer:

We can see that there is no net displacement in the vertical direction. It has only horizontal displacement. Thus, work done by vertical forces on the stone will be zero.

The force of gravity is acting vertically downward; thus the work done by it is zero.

Q3. A battery lights a bulb. Describe the energy changes involved in the process.

Answer:

The chemical energy stored in a battery is transformed into the heat energy which glows the filament of the bulb. Further, the heat energy is converted into light energy.

Q4. Certain force acting on a $20 k g$ mass changes its velocity from $5 m s^{- 1}$ to $2 m s^{- 1}$ . Calculate the work done by the force.

Answer:

By the equations of motion, we can write :

$v^{2} = u^{2} + 2 a s$

$s = \frac{v^{2} - u^{2}}{2 a}$

$= \frac{2^{2} - 5^{2}}{2 a} = \frac{- 21}{2 a} m$

The work done is :

$W = F . s$

$= 20 a \times \frac{- 21}{2 a}$

$= - 210 J$

Thus work done is - 210 J.

Q5. A mass of 10 kg is at a point A on a table. It is moved to a point B . If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer

Answer:

The displacement of the object is horizontal on the table. We know that the gravitational force is acting in a downward direction. There is no displacement vertically.

Thus the work done by the gravitational force is zero.

Q6. The potential energy of a freely falling object decreases progressively. Does this violate the law of conservation of energy? Why?

Answer:

No, there is no violation of the law of conservation of energy. At the maximum height, the energy is in the form of potential energy. When the object reaches the ground, its potential energy decreases, whereas its kinetic energy is increasing (as the velocity of the object is increasing). Thus, there is no loss of total energy (energy transformation may take place ).

Q7. What are the various energy transformations that occur when you are riding a bicycle?

Answer:

The muscular energy of a person is transformed in the form of mechanical energy, which helps to rotate the wheel of bicycle.

Q8. Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?

Answer:

Since the rock doesn't move, the net displacement is zero. As a result, the work done by the force is zero.

The energy that we apply to the rock gets transformed in the form of heat.

Q9. A certain household has consumed 250 units of energy during a month. How much energy is this in joules?

Answer:

We know that 1 unit of energy is given by: 1 unit = 1 KWh.

Also, $1 K W h = 3.6 \times 10^{6} J$

Thus, 250 units in joules is given by :

$E = 250 \times 3.6 \times 10^{6} = 9 \times 10^{8} J$

Q10. An object of mass 40 kg is raised to a height of 5 m above the ground. What is its potential energy? If the object is allowed to fall, find its kinetic energy when it is half-way down.

Answer:

The potential energy of an object of mass m at a height h is given as = mgh

The potential energy of the given object is :

$P . E . = m g h = 40 \times 10 \times 5 = 2000 J$

The potential energy is being converted into the K.E..

Thus, at halfway kinetic energy of the object is :

$K . E . = \frac{P . E .}{2} = \frac{2000}{2} = 1000 J$

Q11. What is the work done by the force of gravity on a satellite moving around the Earth? Justify your answer.

Answer:

The work done by the gravitational force is zero. This is because the satellite is moving in a circular orbit. Thus, the direction of displacement of the satellite is perpendicular to the force of gravity. Hence work done is zero.

Q12. Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.

Answer:

This depends on the initial state of the object. If the object is in motion initially, then it will continue to be in this state as no external force is acting. But if the object is at rest initially, then the object can't move without an external force.

Q13. A person holds a bundle of hay over his head for 30 minutes and gets tired. Has he done some work or not? Justify your answer.

Answer:

Since there was no displacement thus the work done by man is zero. This work should not be considered relatable to the term 'work' we use in daily life.

The weight against gravity led the man to get tired.

Q14. An electric heater is rated 1500 W. How much energy does it use in 10 hours?

Answer:

The relation between energy and power is given by :

Energy = Power $\times$ Time

Thus, the energy used in 10 hours is :

$E = 1500 \times 10 = 15000 W h = 15 K W h$

Hence, the energy used by the heater is 15 kWh.

Q15. Illustrate the law of conservation of energy by discussing the energy changes which occur when we draw a pendulum bob to one side and allow it to oscillate. Why does the bob eventually come to rest? What happens to its energy eventually? Is it a violation of the law of conservation of energy?

Answer :

1651494719629

In the above figure, point B is the mean position about which the bob rotates.

When the bob is released from point C, it attains some velocity while moving down (up to B) and decelerates and stops at point A.

Thus, points A and C are the maximum height points. And the velocity of the bob at point B will be maximum.

The total energy at points A and C is only the potential energy, as their velocity at these points is zero. And at point B, as the height of the bob is zero thus the total energy is just the kinetic energy.

Thus, in this manner, the conservation of energy takes place (by transforming into some other form).

It eventually comes to rest due to the air resistance. It decelerates the motion of the bob. (as it is a frictional force.)

There is no violation of the energy conservation law, as some amount of energy is converted in the form of heat.

Q16. An object of mass m is moving with a constant velocity, v . How much work should be done on the object in order to bring the object to rest?

Answer:

At this moment, the energy of the object is :

$K . E . = \frac{1}{2} m v^{2}$

Thus, in bringing the object to rest, the work needed is: $= K . E .$

$W = \frac{1}{2} m v^{2} J$

Q17. Calculate the work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h?

Answer:

Firstly, convert the velocity into SI units.

$v = 60 \times \frac{5}{18} = \frac{50}{3} m / s$

Thus, the work done to stop the car is equal to the kinetic energy of the car.

$W = \frac{1}{2} m v^{2} = \frac{1}{2} \times 1500 \times {(\frac{50}{3})}^{2}$

$= 208333.33 J o r 208.33 K J$

Q18. In each of the following a force, $F$ is acting on an object of mass, $m$ . The direction of displacement is from west to east shown by the longer arrow.

Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.

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Answer:

(i) In first case, the force acting on the object is perpendicular to the displacement of the body. Thus the work done by the force is zero.

(ii) In this, the force is in the direction of the displacement so the work done is positive.

(iii) In this case, the direction of force and displacement are opposite to each other. Thus the work done by the force is negative.

Q19. Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?

Answer:

Yes. If all the external forces acting on the body balance each other, then the net force acting on the object is zero. Thus, the acceleration produced is zero even if forces are acting on the body. The necessary condition for the zero acceleration is that the net force acting on the body should be zero.

Q20. Find the energy in kWh consumed in 10 hours by four devices of power 500 W each.

Answer:

The energy consumed by 1 device is given by :

$E = 500 \times 10 = 5000 W h$

Thus, the energy consumed by 4 devices is $= 4 \times 5000 = 20 K W h$

Q21. A freely falling object eventually stops on reaching the ground. What happens to its kinetic energy?

Answer:

When an object is falling from a height, there is an increase in the kinetic energy of the object. Thus, just before hitting the ground, the kinetic energy of the object is very high. But after hitting the ground, its velocity comes to zero and thus the kinetic energy becomes zero. The kinetic energy is transformed into other forms of energy, such as heat, sound or some deformation on the ground.

Class 9 Science Chapter 10 - Work and Energy: Higher Order Thinking Skills (HOTS) Questions

The NCERT Chapter 10: Work and Energy HOTS Questions of Class 9 Science is structured to help develop critical thinking and the ability to solve problems. These are higher-order questions that are beyond the basic ones, so that the students can be in a position to practice the concept of work, power and conservation of energy in real-life scenarios.

Q.1 A car of mass 1000 kg accelerates from 0 to 20 m/s in 10 seconds. What power is developed by the car's engine?

Answer:

Power developed by the engine of the car P,

$\begin{aligned} P = force \times velocity \\ = & (1 / 2) \times mass \times {velocity}^{2} / time \\ = & \frac{1}{2} \times 1000 \times 20^{2} = 4000 W \end{aligned}$

Q.2 A car with a constant speed is moving on a straight road. What is the nature of the work done by the engine?

Answer:

Since the car is moving at a constant speed, there is no change in its kinetic energy. Therefore, the net work done on the car by all the forces acting on it is zero, including the work done by the engine.

Q.3 A uniform force of 20 N is applied to a box, displacing it by 5 m. What is the nature of the work done by the force?

Answer:

Work done is given by the equation W = Fd for constant force, where W is the work done, F is the force applied, and d is the distance travelled in the direction of the force. As the force and displacement are in the same direction, the work done is positive.

Q.4 An engine of a car of mass m = 1000 Kg changes its velocity from 5 m/s to 25 m/s in 5 minutes. The power (in KW) of the engine is

Answer:

Power expressed as the rate of change of kinetic Energy -
Power $=$ Work done $/$ time $=$ change in K.E $/$ time

$\begin{aligned} P = \frac{\frac{1}{2} m [(25)^{2} - (5)^{2}]}{5 \times 60} \\ = \frac{\frac{1}{2} \times 1000 \times 600}{5 \times 60} = 1000 W \end{aligned}$

$P = 1 K W$

Q.5 A truck of mass 30,000 kg moves up an inclined plane of slope 1 in 100 at a speed of 30 kmph. The power of the truck is (given g = 10 $m s^{- 2})$

Answer:

$\begin{aligned} \vec{P} = \vec{f} \cdot \vec{V} \\ P = f v \sin θ \\ P = m g \sin θ V \\ = 30000 \times 10 \times \frac{1}{100} \times \frac{30 \times 5}{18} \end{aligned}$
$P = 25 kW$

Class 9 Science Chapter 10 - Work and Energy: Topics

The NCERT Class 9 Science Chapter 10 - Work and Energy presents the students with the basic concepts of physics which govern the interactions of energy and force in our everyday life. Some of the key points discussed in this chapter include work, kinetic energy, potential energy, power, and the law of conservation of energy. Through these topics, the students will find it easy to apply what they learn in the classroom to real-life examples and this makes the subject interesting and beneficial in the exams.

10.1 Work

10.1.2 Scientific Conception Of Work

10.1.3 Work Done By A Constant Force

10.2 Energy

10.2.1 Forms Of Energy

10.2.4 Potential Energy Of An Object At A Height

10.2.5 Are Various Energy Forms Interconvertible?

10.2.6 Law Of Conservation Of Energy

10.3 Rate Of Doing Work

Approach to Solve Questions of Class 9 Science Chapter 10 - Work and Energy

Class 9 Science Chapter 10 - Work and Energy question answers demand conceptual clarity and practice in solving problems because this chapter is a mix of theory and numericals. It is important that students learn the definitions, formulas, and uses of work, energy and power and do questions that require calculation. The systematic method provides precision in the exams and creates a solid groundwork in higher-level classes.

Understand the Concept of Work: First of all, it is necessary to revise the definition of work, the conditions under which work should be performed, and the formula W=F×d×cosθ. Questions that involve the direction of force and displacement should be carefully checked to prevent errors.
Revise Significant Energy Formulas: Learn and use formulae of kinetic energy $\left(K E=\frac{1}{2} m v^2\right)$ and potential energy, PE=mgh. Solve conceptual and numerical problems with the use of the law of conservation of energy.
Focus on Numerical Accuracy: Practice as many Class 9 Work and Energy numericals as possible of mass, velocity, height, and acceleration due to gravity. To obtain complete marks, always be sure to write in correct units (Joules, Watts, etc.).
Link Theory and Practical Life: Relate energy concepts with examples like a moving car (kinetic energy), a raised object (potential energy), and electric appliances (power consumption). This aids in solving questions that are application-based.
Practice HOTS and Case-Based Questions: Go beyond NCERT in-text questions by attempting Higher Order Thinking Skills (HOTS) and case-study-based problems. Pay attention to answers based on rationality like why energy can be conserved in various processes.
Use Diagrams for Clarity: Draw neat diagrams for explanations wherever applicable (like energy transformations). A properly labelled drawing will allow you to earn some extra marks.
Make a Formula & Concept Sheet: Have a cheat sheet with all formulas, SI units, and laws that can be reviewed last-minute, just in time to study for an exam. This makes it easier to recall and be more accurate in exams.

Benefits of Work and Energy NCERT Solutions

The Class 9 Science Chapter 10 - Work and Energy question answers give the student a good explanation of the fundamental concepts such as work, energy, power and law of conservation of energy. They are solutions that are made by subject experts according to the latest CBSE syllabus, which is accurate and exam-relevant. They not only assist the students in reinforcing their basics but also instil confidence in the students in solving theory-based and numerical questions.

Concept Clarity- Concepts such as work, energy, power and conservation of energy have been explained simply and thus are easy to grasp, as shown by the solutions.
Step-by-step Solutions- Solutions to each question are clearly described and presented step by step in a style that a student can learn how to write the answer in the exam.
Exam Preparation- The solutions are strictly done as per the CBSE syllabus, so that students can be assured to confidently prepare themselves to be presented to the board examinations and competitive tests.
Practice of HOTS & Numerical Questions - Consists of higher-order thinking questions and numerical problems to reinforce applications-oriented learning.
Quick Revision Tool - This is helpful when needing to do last-minute revision since its contents list formulas, definitions, and key concepts in brief form.
Enhances Confidence - The practice with these solutions enables the student to answer the problems quickly and correctly.

NCERT Solutions for Class 9 Science Chapter-wise

The NCERT Solutions of Class 9 Science (Science-Chapter-wise) not only give in-depth solutions to every question in the textbook but also make the students develop a firm understanding of concepts. The step-wise answers simplify revision, help with exam practice, and develop problem-solving confidence in Physics, Chem and Biology.

NCERT Solutions for Class 9 Chapter 1 Matter in Our Surroundings

NCERT Solutions for Class 9 Chapter 2 Is Matter Around Us Pure

NCERT Solutions for Class 9 Chapter 3 Atoms and Molecules

NCERT Solutions for Class 9 Chapter 4 Structure of The Atom

NCERT Solutions for Class 9 Chapter 5 The Fundamental Unit of Life

NCERT Solutions for Class 9 Chapter 6 Tissues

NCERT Solutions for Class 9 Chapter 7 Motion

NCERT Solutions for Class 9 Chapter 8 Force and Laws of Motion

NCERT Solutions for Class 9 Chapter 9 Gravitation

NCERT Solutions for Class 9 Chapter 10 Work and Energy

NCERT Solutions for Class 9 Chapter 11 Sound

NCERT Solutions for Class 9 Chapter 12 Improvement in Food Resources

NCERT Solutions for Class 9 - Subject Wise

NCERT Solutions for Class 9 Maths

NCERT Solutions for Class 9 Science

Also Check NCERT Books and NCERT Syllabus here:

Frequently Asked Questions (FAQs)

Q: Why do we feel tired even when holding a heavy object without moving it?

Scientifically, no work is done (as there is no displacement), but our muscles use up energy to maintain tension, which makes us feel tired.

Q: Why is the law of conservation of energy important in daily life?

It helps us understand energy transformations in machines, electricity use, vehicles, and natural processes, ensuring efficient use of resources.

Q: Why should I solve Work And Energy Class 9 NCERT Science Chapter 10 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 10 Work And Energy.

Q: What are some Work and Energy Class 9 important questions and answers to focus on for exams?

Some of the Work and Energy Class 9 important questions and answers include numerical problems on work done, types of energy, power, and conservation of energy. Focusing on these will help you score better in exams and build strong concepts.

Q: Are NCERT Solutions for Class 9 Science Chapter 10 sufficient for exam preparation?

While NCERT Solutions for Class 9 Science Chapter 10 are a good resource for exam preparation, it is recommended that students also practice solving other reference books and previous year's question papers to get a better understanding of the concepts and exam patterns.

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Option 1) $0.34\; J$	Option 2) $0.16\; J$
Option 3) $1.00\; J$	Option 4) $0.67\; J$

Option 1) $2,000 \; J - 5,000\; J$	Option 2) $200 \, \, J - 500 \, \, J$
Option 3) $2\times 10^{5}J-3\times 10^{5}J$	Option 4) $20,000 \, \, J - 50,000 \, \, J$

Option 1) $K/2\,$	Option 2) $\; K\;$
Option 3) $zero\;$	Option 4) $K/4$

Option 1) $11.2\, L\, H_{2(g)}$ at STP is produced for every mole $HCL_{(aq)}$ consumed	Option 2) $6L\, HCl_{(aq)}$ is consumed for ever $3L\, H_{2(g)}$ produced
Option 3) $33.6 L\, H_{2(g)}$ is produced regardless of temperature and pressure for every mole Al that reacts	Option 4) $67.2\, L\, H_{2(g)}$ at STP is produced for every mole Al that reacts .

Option 1) 0.02	Option 2) 3.125 × 10^-2
Option 3) 1.25 × 10^-2	Option 4) 2.5 × 10^-2

Option 1) decrease twice	Option 2) increase two fold
Option 3) remain unchanged	Option 4) be a function of the molecular mass of the substance.

Option 1) Molality	Option 2) Weight fraction of solute
Option 3) Fraction of solute present in water	Option 4) Mole fraction.

Option 1) twice that in 60 g carbon	Option 2) 6.023 × 10²²
Option 3) half that in 8 g He	Option 4) 558.5 × 6.023 × 10²³

Option 1) less than 3	Option 2) more than 3 but less than 6
Option 3) more than 6 but less than 9	Option 4) more than 9

NCERT Solutions for Class 9 Science Chapter 10 - Work and Energy

Class 9 Science Chapter 10 - Work and Energy Question Answers: Download PDF

Work and Energy NCERT Solutions: Solved Exercise Questions

Class 9 Science Chapter 10 - Work and Energy: Higher Order Thinking Skills (HOTS) Questions

Class 9 Science Chapter 10 - Work and Energy: Topics

Approach to Solve Questions of Class 9 Science Chapter 10 - Work and Energy

Benefits of Work and Energy NCERT Solutions

NCERT Solutions for Class 9 Science Chapter-wise

NCERT Solutions for Class 9 - Subject Wise

Also Read,

Also Check NCERT Books and NCERT Syllabus here:

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