- Friction Class 8 Case Study Questions Science Chapter 9
Last Updated on September 12, 2024 by XAM CONTENT
Hello students, we are providing case study questions for class 8 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 8 science. In this article, you will find case study questions for cbse class 8 science chapter 9 Friction.
Table of Contents
Case Study Questions on Friction
Question 1:
Read the given passage below and answer the question:
(I) The force required to overcome friction at the instant an object starts moving from rest is a measure of static friction. On the other hand, the force required to keep the object moving with the same speed is a measure of sliding friction. The sliding friction is slightly smaller than the static friction. When one body rolls over the surface of another body, the resistance to its motion is called rolling friction. Rolling reduces friction. It is always easier to roll than to slide a body over another.
Q.1. The following options show arrangement of types of friction according to decreasing order of applied friction. Select the correct order. (a) Rolling > Sliding > Static (b) Static > Rolling > Sliding (c) Sliding > Static > Rolling (d) Static > Sliding > Rolling
Difficulty Level: Easy
Ans. Option (d) is correct. Explanation: Rolling friction is least among all three types because the surface of wheels has minimal contact with the surface on which it rolls, thus minimising friction.
Q.2. In which of the following case one will have to apply maximum force? (a) Riding a bicycle (b) Trying to move a heavy rock from its resting place (c) Swimming in a pool (d) Drilling a hole in a wall
Ans. Option (b) is correct. Explanation: Stationary rock will experience static friction. Static friction is the highest; thus it will require maximum force or efforts to move it from its rest position.
Q.3. Oiling or greasing in machine parts: (a) Increases the friction between the parts (b) Decreases the friction between the parts (c) Both (a) and (b) are correct. (d) None of the above
Ans. Option (b) is correct.
Explanation: Oiling and greasing act as a lubricant. When oil, grease or graphite is applied between the moving part of a machine, a thin layer is formed there and moving surfaces do not directly rub against each other. Interlocking of irregularities is avoided to a great extent. Movement becomes smooth.
Q.4. Why static friction is more than sliding friction?
Ans. The friction is caused by the interlocking of irregularities in the two surfaces. It is obvious that the force of friction will increase if the two surfaces are pressed harder. The force required to overcome friction at the instant an object starts moving from rest is a measure of static friction. On the other hand, the force required to keep the object moving with the same speed is a measure of sliding friction. When the box starts sliding, the contact points on its surface, do not get enough time to lock into the contact points on the floor. So, the sliding friction is slightly smaller than the static friction.
Q.5. Classify the given examples into static, sliding and rolling friction Papers on a table, a box sliding on an inclined plain, car parked on a hill, ball moving on the ground, child playing on slide in a park, tyres of a bus.
Ans. Static Friction: Papers on a table, car parked on a hill. Sliding Friction: A box sliding on an inclined plain, child playing on slide in a park Rolling Friction: Ball moving on the ground, tyres of a bus.
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Topics from which case study questions may be asked
- Learn the concept of friction.
- Understand the factors that affect frictional force.
- Learn the different types of friction.
- Understand the advantages and disadvantages of friction.
- Learn the methods to increase or decrease friction.
- Understand the concept of fluid friction and methods to reduce it.
The force which opposes the relative motion between two surfaces in contact is called friction. Friction is a necessary evil that makes us walk, write, hold things, etc. The liquids and gases also exert opposition forces on objects moving through them. This is called fluid friction.
Frequently Asked Questions (FAQs) on Friction 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 8 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 friction, and formulate well-supported solutions or responses.
Q4: Are there any resources available online for students to practice case study questions on class 8 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.
Q5: How can students effectively prepare for case study questions on friction 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 friction class 8 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 concepts of friction.
Q7: Why soles of the rubber slippers become slippery after prolonged use?
A7: While walking the slipper’s sole and ground surface experiences friction which causes the sole to wear off.
Q8: What are lubricants? How do they work? Give two examples.
A8: The substances which reduce friction are called lubricants. Example Oil, grease, graphite etc. They work by forming a thin layer between machine parts. As a result, the moving surfaces do not directly rub against each other. Interlocking of irregularities is avoided to a great extent. Movement becomes smooth.
Q9: Will the force of friction come into play, when a rain drop rolls down a glass window pane?
A9: Yes, friction comes into play when two surfaces are in contact, e.g., glass and water in this case.
Q10: While playing tug of war, Preeti felt that the rope was slipping through her hands. Suggest a way out for her to prevent this.
A10: To prevent slipping the rope from her hands, Preeti has to make her hands somewhat non-smooth, so she can rub her hands by introducing the sand between them.
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