Work, Energy and Power Class 11 Case Study Questions Physics Chapter 5

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Last Updated on April 20, 2025 by XAM CONTENT

Hello students, we are providing case study questions for class 11 Physics. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 11 Physics. In this article, you will find case study questions for cbse class 11 Physics chapter 5 Work, Energy and Power.

Chapter	Work, Energy and Power
Type of Questions	Case Study Questions
Nature of Questions	Competency Based Questions
Board	CBSE
Class	11
Subject	Physics
Useful for	Class 11 Studying Students
Answers provided	Yes
Difficulty level	Mentioned
Important Link	Class 11 Physics Chapterwise Case Study

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Table of Contents

Case Study Questions on Work, Energy and Power

Case Study Question 1:

Passage:
A body is being pushed along a horizontal surface by a variable force defined as $F(x)=5 x$, where $F$ is in newtons and $x$ is the displacement in meters. A student calculates the work done by the force in moving the object from $x=0 \mathrm{~m}$ to $x=4 \mathrm{~m}$.

Q1. Which method should be used to calculate the work done by this variable force?
(a) Newton’s second law
(b) Dot product of vectors
(c) Integration
(d) Substitution

Q2. What is the work done by the force from x=0x = 0x=0 to x=4x = 4x=4 m?
(a) 20 J
(b) 40 J
(c) 10 J
(d) 5 J

Q3. Which of the following graphs represents the situation best?
(a) Force vs. Time – straight line
(b) Force vs. Displacement – straight line
(c) Velocity vs. Time – curved line
(d) Work vs. Time – horizontal line

Q4. What is the area under the curve of Force vs. Displacement graph in this case?
(a) It gives acceleration
(b) It gives mass
(c) It gives work done
(d) It gives kinetic energy

Answers:

Q1. (c)
Q2.

$$
W=\int_0^4 5 x d x=5\left[\frac{x^2}{2}\right]_0^4=5 \times \frac{16}{2}=40 \mathrm{~J} \Rightarrow(\mathrm{~b})
$$

Q3. (b)
Q4. (c)

Case Study Question 2:

Passage:
A scooter of mass 150 kg climbs a 30° inclined plane with constant speed. The frictional force opposing motion is 100 N. The scooter covers a distance of 100 m along the slope in 20 seconds. The student is asked to calculate power output and energy consumed.

Q1. What is the total force opposing motion along the slope?
(a) $m g \sin \theta+f$
(b) $m g \cos \theta+f$
(c) $f$ only
(d) Zero, since motion is constant

Q2. Work done by the scooter in climbing the slope is:
(a) 0 J
(b) $(m g \sin \theta+f) \times 100$
(c) $(m g \cos \theta-f) \times 100$
(d) $f \times 100$

Q3. What is the power delivered by the engine?
(a) Work / time
(b) Force $\times$ Speed
(c) Both (a) and (b)
(d) Mass $\times g$

Q4. What is the correct expression for efficiency in this case?
(a) $\frac{\text { Kinetic Energy }}{\text { Work Input }}$
(b) $\frac{\text { Work against gravity }}{\text { Power output }}$
(c) $\frac{\text { Useful work }}{\text { Total work done }}$
(d) $\frac{\text { Power output }}{\text { Energy loss }}$

Answers:

Q1. (a)
Q2. (b)

$$
W=\left[150 \times 10 \times \sin 30^{\circ}+100\right] \times 100=(750+100) \times 100=85,000 \mathrm{~J}
$$

Q3. (c)

$$
P=\frac{W}{t}=\frac{85000}{20}=4250 \mathrm{~W}
$$

Q4. (c)

Case Study Question 3:

Passage:
A spring of spring constant $k=500 \mathrm{~N} / \mathrm{m}$ is compressed by 0.2 m and then released to launch a 1 kg block horizontally on a frictionless surface. The student is asked to compute the velocity, energy transformations, and motion characteristics.

Q1. What type of energy is stored in the spring when compressed?
(a) Kinetic energy
(b) Potential energy (gravitational)
(c) Elastic potential energy
(d) Chemical energy

Q2. What is the total mechanical energy of the block just after release?
(a) $\frac{1}{2} k x^2$
(b) $m g h$
(c) $\frac{1}{2} m v^2$
(d) Both (a) and (c)

Q3. What is the velocity of the block just after release?
(a) $\sqrt{500} \mathrm{~m} / \mathrm{s}$
(b) $\sqrt{20} \mathrm{~m} / \mathrm{s}$
(c) $10 \mathrm{~m} / \mathrm{s}$
(d) $5 \mathrm{~m} / \mathrm{s}$

Q4. If a rough surface is introduced after 1 m, what happens to total mechanical energy?
(a) It remains constant
(b) It increases
(c) It decreases due to work done against friction
(d) It becomes infinite

Answers:

Q1. (c)
Q2. (a)
Q3.

$$
\frac{1}{2} k x^2=\frac{1}{2} m v^2 \Rightarrow \frac{1}{2} \times 500 \times 0.04=\frac{1}{2} \times 1 \times v^2 \Rightarrow v^2=20 \Rightarrow v=\sqrt{20} \approx 4.47 \mathrm{~m} / \mathrm{s} \Rightarrow(\mathrm{~b})
$$

Q4. (c)

We hope the given case study questions for Work, Energy and Power Class 11 helps you in your learning.

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Topics from which case study questions may be asked

Work done by constant force
Kinetic and potential energy
Work-energy theorem
Power

The work-energy theorem links force, displacement, and kinetic energy, forming the core of energy transfer studies.

For further practice on case study questions related to Work, Energy and Power Class 11 Physics, we recommend exploring the link given below.

Practice More Case Study Questions on “Work, Energy and Power”

Frequently Asked Questions (FAQs) on Work, Energy and Power Case Study Questions

Q1: What are case study questions in Work, Energy and Power?

A1: Case study questions in Work, Energy and Power test your ability to apply concepts in real-life scenarios.

Q2: Are these questions asked in board exams?

A2: Yes, CBSE has started including case study/competency-based questions in final exams.

Q3: How should I prepare for case study questions?

A3: Focus on understanding concepts and practicing application-based problems.

Q4: Are answers provided for Class 11 Physics Work, Energy and Power case study questions?

A4: Yes, detailed answers are provided for all questions.

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