Last Updated on December 2, 2024 by XAM CONTENT
Hello students, we are providing case study questions for class 9 science. 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 9 science. In this article, you will find case study questions for cbse class 9 science chapter 10 Work and Energy.
| Chapter | Work and Energy |
| Type of Questions | Case Study Questions |
| Nature of Questions | Competency Based Questions |
| Board | CBSE |
| Class | 9 |
| Subject | Science |
| Theme | Moving Things, People and Ideas |
| Useful for | Class 9 Studying Students |
| Answers provided | Yes |
| Difficulty level | Mentioned |
| Important Link | Class 9 Science Chapterwise Case Study |
Case Study Questions on Work and Energy
Questions
Question 1:
Work is said to be done when the force applied on an object produces a displacement of the object in the direction of force applied. For example, when we push or pull a heavy load or lift it above the floor then we are doing work, but a man carrying heavy load and standing still is not doing any work. Work, which is the product of force and displacement, has only magnitude and no direction. So, it is a scalar quantity.
Read the given passage carefully and give the answer of the following questions:
Q 1. A man raises a box of mass 50 kg to a height of 2 m in 10 s, while another man raises the same box to the same height in 50 s. What is the ratio of work done by them?
Difficulty Level: Medium
Q 2. If force and displacement of the particle (in direction of force) are doubled, what should be the amount of work?
Difficulty Level: Easy
Q 3. A coolie lifts a luggage of 10 kg from the ground and put it on his head 1.8 m above the ground. What would be the work done by him on the luggage?
Difficulty Level: Medium
Q 4. A student carries a bag weighing 5 kg from the ground floor to his class on the first floor that is 2 m high. What is the work done by the boy?
Difficulty Level: Medium
Q 5. Calculate the value of work done in holding a suitcase of 15 kg while waiting for a bus for 40 minutes.
Difficulty Level: Medium
Answers
1. We know that, $W=F \times s \Rightarrow$ Work done is independent of time taken. Hence, in both the cases,
$W=$ $50 \times 10 \times 2=1000 \mathrm{~J}$
Thus, ratio of work done $=1000: 1000=1: 1$
2. The work should be 4 times.
3. Mass of luggage, $m=10 \mathrm{~kg}$ and displacement, $s=1.8 \mathrm{~m}$
Work done, $W=F \times s=m g \times s$
$$
=10 \times 10 \times 1.8=180 \mathrm{~J}
$$
4. Here, mass of bag, $m=5 \mathrm{~kg}$ and displacement, $s=2 \mathrm{~m}$
Work done, $W=F \times s=m g \times s$
$$
=5 \mathrm{~kg} \times 10 \mathrm{~m} \mathrm{~s}^{-2} \times 2 \mathrm{~m}=100 \mathrm{~J}
$$
5. Displacement in holding a suitcase while waiting for a bus, i.e., stationary position $=0$
$$
\begin{aligned}
& \therefore \quad \text { Work done }=\text { force } \times \text { zero } \\
& \quad \Rightarrow \text { Work done }=\text { zero. }
\end{aligned}
$$
Also check
Case study questions for other chapters of class 9 science is given below.
- Improvement in Food Resources Class 9 Case Study Questions Science Chapter 12
- Sound Class 9 Case Study Questions Science Chapter 11
- Work and Energy Class 9 Case Study Questions Science Chapter 10
- Gravitation Class 9 Case Study Questions Science Chapter 9
- Force and Laws of Motion Class 9 Case Study Questions Science Chapter 8
- Motion Class 9 Case Study Questions Science Chapter 7
- Tissues Class 9 Case Study Questions Science Chapter 6
- The Fundamental Unit of Life Class 9 Case Study Questions Science Chapter 5
- Is Matter Around Us Pure Class 9 Case Study Questions Science Chapter 2
- Matter in Our Surroundings Class 9 Case Study Questions Science Chapter 1
We hope the given case study questions for Work and Energy Class 9 helps you in your learning.
Helpful Links for CBSE Class 9 Science Preparation
- Download Latest Sample Papers for CBSE Class 9 Science
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- Download Case Study Question Bank for CBSE Class 9 Science
- Download Numerical Problems for CBSE Class 9 Physics
- Download Important MCQs for CBSE Class 9 Physics
Topics from which case study questions may be asked
- Work done by a Force
- Energy
- Power
- Kinetic and Potential energy
- Law of conservation of energy (excluding commercial unit of Energy).
Work is said to be done when the force applied on the body displaces its position in the direction of the applied force.
Conditions for Work to be Done:
- A force should act on the body.
- The body must be displaced from its position.
Work Done by a Constant Force: It is the product of the force and the distance moved by the body in the direction of the applied force, i.e., W = F x s. It is a scalar quantity.
SI Unit of Work: The SI unit of work is Newton-metre (N-m) or Joule (J).
1 Joule: It is the amount of work done on a body when a force of 1 N displaces it by 1 m along the line of action of the force.
Frictional force acts in the direction opposite to the direction of displacement, so work done by friction will be negative.
Energy is the capacity or the ability of the body to do work. Its SI unit is Joule (J) and is a scalar quantity.
Forms of Energy: There are various forms of energy such as kinetic energy, potential energy, etc.
Heavy objects which are moving with a high speed possess more kinetic energy as compared to smaller objects moving with less speed.
For further practice on case study questions related to Work and Energy Class 9 Science, we recommend exploring the link given below.
Quiz
| Topic | Work and Energy |
| Useful for | CBSE Class 9 Students |
| Type of Questions | MCQs |
| No. of Questions | 30 |
| Solutions | Instant Solutions after Completion of Quiz |
| Quiz Link | Click here to Take Test |
| Price | Free |
How to take quiz or test using the given link
It’s quite simple!
Step 1: Click on the given link. You will see the below screen.
Step 2: Fill in the necessary details. There is no need to register. Just fill your email and name and click on the button “Take Assessment”. The below screen will appear.
Step 3: Click on start assessment. Now you are ready to take test.
Frequently Asked Questions (FAQs) on Work and Energy Case Study Questions
Q1: What are case study questions for CBSE examinations?
A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.
Q2: Why are case study questions important for understanding class 9 science chapters?
A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.
Q3: How should students approach answering case study questions for CBSE?
A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.
Q4: Are there any resources available online for students to practice case study questions on class 9 science chapters for CBSE exams?
A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.
Q5: How can students effectively prepare for case study questions on “Work and Energy” for CBSE exams?
A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.
Q6: How can teachers incorporate case study questions on “Work and Energy” class 9 science into classroom teaching?
A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of “Work and Energy”.
Q7: When is work done by a force zero?
A7: Work done by a force is zero when the direction of force and displacement of an object are perpendicular to each other or when the displacement is zero.
Q8: A student sitting in a class does his examination paper in three hours. How much work is done by the student?
A8: No work is done by the student as there is no displacement.
Q9: What kind of energy transformations take place at a thermal power station?
A9: At a thermal power station, the chemical energy of coal is changed into heat energy which is further changed into electrical energy.
Q10: When a body is thrown upwards, its velocity becomes zero at the highest point. What will be its acceleration at this point?
A10: The acceleration at this point is equal to the value of g in the downward direction
Q11: A bullet is fired from a gun. Which will have a greater kinetic energy; the bullet or the gun?
A11: The bullet will possess greater kinetic energy.
Q12: Two identical objects, one of iron and the other of wood, are dropped from the same height on sand. Which will penetrate more and why?
A12: Iron object will penetrate more as it has more potential energy because of its greater mass.
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