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Case Study Questions Class 9 Science Motion

Case study questions class 9 science chapter 8 motion.

CBSE Class 9 Case Study Questions Science Motion. Important Case Study Questions for Class 9 Exam. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Motion.

At Case Study Questions there will given a Paragraph. In where some Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks or 4 marks.

CBSE Case Study Questions Class 9 Science – Motion

(1) Distance and displacement are two quantities that seem to mean the same but are different with different meanings and definitions. Distance is the measure of “how much distance an object has covered during its motion” while displacement refers to the measure of“how far the abject actually from initial place.” using this data answer following questions.

(i)Which of the following relation is always true when object moves in straight line

(a)distance is always equal to displacement

(b)distance is always greater than or equal to displacement

(c)distance is always lesser than or equal to displacement

(d)none of the above

(ii) Kapiltravels 20 km to North but then come back to South for 40 km to pick up a friend. Whatis kapil’s total distance?

(d) none of the above

(iii) Rahul travels 20 km to East but then come back to West for 10 km. Find displacement.

(iv) Define distance and displacement of particle.

(v) Write difference between distance and displacement

Answer key -1

(iv) Distance and displacement are two quantities that seem to mean the same but are different with different meanings and definitions. Distance is the measure of “how much distance an object has covered during its motion” while displacement refers to the measure of “how far the abject actually from initial place.”

(v) difference between distance and displacement is given by

(2 ) Answer the following questions by observing following diagram

(i ) What is distance and displacement when particle moves from point A to B?

(a)distance is equal to displacement

(b)distance is greater than and equal to displacement

(c)distance is lesser than and equal to displacement

(ii)What is Displacement when particle moves from point A to D?

(iii) What is Displacement when particle moves from point A to C through A-B-C?

(c) 10√2 km

(iv) Find distance covered when particle moves in path ABCDA i.e. starts from A and ends at A?

(v) Find Displacement covered when particle moves in path ABCDA i.e. starts from A and ends at A?

ANSWER KEY-2

(3) The speed of an object is the distance covered per unit time,and velocity is the displacement per unit time.To specify the speed of anobject, we require only its magnitude while Velocity is the speed of an object moving in adefinite direction.

(i) S.I unit of speed is

(d) none of these

(ii) Which of the following is true

(a)speed is scalar

(b)velocity is vector

(c)both a and b

(d)none of these

(iii) To specify speed we require

(a)magnitude

(b)direction

(c)both magnitude and direction

(iv) Define speed and velocity of  particle.

(v)Differentiate between speed and velocity.

Answer key-3

(iv)The speed of an object is the distance covered by object per unit time.Velocity is defined as the displacement by particle per unit time.

(v) Difference between speed and velocity.

(4) The speed of an object need not be constant. In most cases, objects will be in non-uniform

motion. Thereforewe describe the rate of motion of such objects in terms of their average speed. The average speed of an object is obtained by dividing the total distance travelled by the total time taken. That is, average speed =total distance travelled / total time taken. Answer the following.

(i)An object travels 20 m in 5 s and then another 20 m in 5s. What is the average speed in m/s of the object?

(d) None of these

(ii) An object travels 20 m in 5 s and then another 40 m in 5s. What is the average speed in m/s of the object?

(d)None of these

(iii)A man starts walking from a point P on a circular field of radius 7 km and after 1 hour later he comes to same point P after one complete round. find his speed. (take pi=22/7)

(a) 30km/hr

(b) 40km/hr

(c) 44km/hr

(d) 33km/hr

(iv) A man travelled on square field of side 10m .he completed one round of field by taking time 2s, 3s 1s and 2s respectively for each side. Find his average speed.

(v) Define average speed.write its formula and SI unit

Answer key-4

(v) The average speed of an object is obtained by dividing the total distance travelled by the total time taken. That is, average speed =total distance travelled / total time taken.Its SI unit is given by  m/s.

(5) We know that the circumference of a circle of radius r is given by . If the body takes

t seconds to go once around the circular path of radius r, the speed v is given by

When an object moves in a circular path with uniform speed, its motion is called

uniform circular motion. Refer the paragraph and answer the following questions

(i) What happens when a body is moving with constant speed?

(a)acceleration is non uniform

(b)velocity is uniform

(c)velocity is changing

(ii) Cyclist on circular track with constant speed is example of

(a)uniform circular motion

(b)nonuniform circular motion

(iii) Which of the following changes whenbody performsuniform circular motion?

(b)direction of velocity

(iv) Define uniform circular motion. Give 2 examples of uniform circular motion

(v) Give the name of device used for measurement of speed of rotation

Answer key -5

(iv) When an object moves in a circular path with uniform speed, its motion is calleduniform circular motion. Rotation of hour hand of clock and motion of fan at constant speed are examples of uniform circular motion.

(v) Odometers and speedometers are two of the many instruments used to measure speed of rotation.

Plz put more difficult these all are very much easy.

But all over excellent

Yes we have think also it. This year we will put more hard.

A bit hard question may be helpful

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Category: Case Study Questions for Class 9 Science

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Case Study Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Case study questions for class 9 science chapter 15 improvement in food resources, case study questions for class 9 science chapter 14 natural resources, case study questions for class 9 science chapter 12 sound, case study and passage based questions for class 9 science chapter 9 force and laws of motion, case study and passage based questions for class 9 science chapter 8 motion, case study and passage based questions for class 9 science chapter 7 diversity in living organisms, case study and passage based questions for class 9 science chapter 6 tissues, case study and passage based questions for class 9 science chapter 2 is matter around us pure, case study and passage based questions for class 9 science chapter 5 the fundamental unit of life, case study and passage based questions for class 9 science chapter 13 why do we fall ill, case study and passage based questions for class 9 science chapter 11 work and energy, case study and passage based questions for class 9 science chapter 10 gravitation, case study and passage based questions for class 9 science chapter 4 structure of atom, case study and passage based questions for class 9 science chapter 3 atoms and molecules.

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• Work and Energy Class 9 Case Study Questions Science Chapter 10

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.

Table of Contents

Case Study Questions on Work and Energy

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?

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?

Q 5. Calculate the value of work done in holding a suitcase of 15 kg while waiting for a bus for 40 minutes.

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 $=0$ $$ \begin{aligned} & \therefore \quad \text { Work done }=\text { force } \times \text { zero } \\ & \quad \Rightarrow \text { Work done }=\text { zero. } \end{aligned} $$

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
• 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
• Download Worksheets for CBSE Class 9 Science
• Download Chapter Tests for CBSE Class 9 Science
• 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
• 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.

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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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