Find Complete Friction Class 8 Questions and Answers for Better Understanding
Class 8 Science Friction is an important chapter that provides students with a solid understanding of the forces that oppose motion. Friction Class 8 is a fundamental concept in physics that affects everyday life in various ways. In Class 8 Science Chapter 9 Question Answer, you'll delve into the nature of friction, its types, and its effects on different surfaces.
Table of Content
Vedantu’s NCERT Solutions for Class 8 Science Chapter Friction offers comprehensive solutions to all the questions in this chapter, facilitating a smoother learning process. The Friction Class 8 Solutions are prepared by Vedantu’s Master Teachers that help you grasp the important concepts of this topic. Download the FREE PDF of Class 8 Science Chapter 2 Question Answer, updated according to the CBSE Class 8 Science syllabus. Start learning with Vedantu and achieve academic success!
Glance on NCERT Solutions for Class 8 Science Chapter 9 Friction
Class 8 Science Chapter Friction Question Answer provides a comprehensive understanding of friction, its types, and the factors influencing it.
Friction Class 8 PDF delves into the concept of friction as a force that opposes motion, explaining its significance in everyday life and various technological applications.
Class 8 Science Chapter 9 discusses the different types of friction, including static, sliding, and rolling friction, and explores the conditions under which each type occurs.
Detailed explanations are provided on the methods of increasing and reducing friction, highlighting the practical uses and challenges associated with these adjustments in real-world scenarios.
Utilising these NCERT Class 8 Science Chapter 9 Question Answer can help students evaluate their grasp of friction, enhance their problem-solving skills, and prepare effectively for exams.
Friction opposes the ________ between the surfaces in contact with each other.
Ans: Motion
Friction depends on the _________ of surfaces.
Ans: Nature
Friction produces _________.
Ans: Heat
Sprinkling of powder on the carrom board ________ friction.
Ans: Reduce
Sliding friction is ________ than the static friction.
Ans: Lesser
rolling, static, sliding
rolling, sliding, static
static, sliding, rolling
sliding, static, rolling
Ans: (c) Static, sliding, rolling.
Static Friction: When we move an object which is at rest.
Sliding Friction: Acts on a body when it is moving.
Rolling Friction: Here the area of contact is smallest when compared to static and sliding friction.
a. Wet marble floor, dry marble floor, newspaper and towel.
b. Newspaper, towel, dry marble floor, wet marble floor.
c. Towel, newspaper, dry marble floor, wet marble floor
d. Wet marble floor, dry marble floor, towel, newspaper
Ans : (a) Wet marble floor, dry marble floor, newspaper and towel.
Friction will be more if the surface is rough and it will be less if the surface is smooth. Hence, wet marble floor, dry marble floor, newspaper and towel is the correct sequence of these surfaces when arranged according to the increase in the force of friction acting on the car.
Ans: When a book slides down a table, frictional force always acts always opposite to the direction of motion and along the incline.
Force of friction will always be parallel to the surfaces in contact.
Ans: It would be difficult to walk on the floor when soapy water falls on the floor then the friction reduces therefore the chances to slip increases, as a result it becomes difficult to walk.
When there is no soapy water then there will be interlocking between the foot and the ground.
When soap water spills the interlocking gets spoilt as a result friction reduces.
Ans: Spikes present on the shoes make the surface of the shoes rough. This increases the friction. As friction increases, the grip on the ground increases. This makes it easier for them to walk or run.
Ans:
Friction is directly proportional to mass. Heavier an object more force to be applied to move it.
Heavier box will press the floor surface harder as compared to the lighter box.
The two surfaces are pressed harder against each other, so the force required to overcome the interlocking is more in case of the heavier box.
So Seema has to apply more force as compared to Iqbal.
Ans: During sliding, contact points do not get enough time to get interlocked properly. Friction forces come into play when irregularities present in the surface of the two objects in contact get interlocked with each other. When an object is in motion, the sliding friction is smaller than the static friction as the interlocking during motion is very small. Thus, sliding friction is less than static friction.
Ans:
Friction is a friend in the below ways:
It helps us to walk.
It helps us to hold things.
It helps in grinding.
It helps in construction purposes.
It makes matchstick ignition possible.
Friction as a foe in the below ways:
It opposes motion.
It produces a lot of heat which results in wastage of energy.
It brings about wear and tear of machinery parts.
It leads to the application of more power in machines.
It produces noise in the machines.
Ans: Special shapes experience less fluid friction therefore can move easily through fluids. When an object moves in fluid, fluid friction opposes the motion. So, to reduce the friction between object and fluids, the object is given a special shape known as streamlined shape.
An aeroplane is a good example for this. The air exerts some friction when the aeroplane moves through the air. This will be opposed by the motion of the aeroplane. In order to overcome this friction, the aeroplane has to apply a lot of force. This force is in turn a waste of energy. So, it is necessary to design the shape of the aeroplane in such a way that it experiences less fluid friction.
Class 8 Science Chapter 9 Friction - Quick Overview of Topics Covered
Class 8 Science Chapter 9 - Friction- Important Points
Friction is a force that opposes the relative motion between two surfaces in contact.
Types of Friction:
Static Friction: The friction that acts on objects when they are not moving.
Sliding Friction: The friction that occurs when one object slides over another.
Rolling Friction: The friction that occurs when an object rolls over a surface.
Fluid Friction: The resistance experienced by objects moving through a fluid (liquid or gas).
Factors Affecting Friction:
Nature of Surfaces: Rough surfaces have more friction compared to smooth surfaces.
Normal Force: The force exerted by a surface perpendicular to the object. The greater normal force increases friction.
Contact Area: Larger contact areas can increase friction.
Advantages of Friction:
Enables walking without slipping.
Helps in writing by providing a grip to the pen or pencil.
Essential for the functioning of various machines and tools.
Disadvantages of Friction:
Causes wear and tear of moving parts in machinery.
Leads to energy loss in the form of heat.
Reduces efficiency of machines.
Methods to Reduce Friction:
Lubrication: Applying lubricants like oil or grease to surfaces.
Use of Ball Bearings: Reduces rolling friction in machines.
Streamlining: Designing objects to reduce fluid friction.
Benefits of Vedantu’s Class 8 Science Chapter 9 Friction Question Answers
Vedantu’s NCERT Class 8 Science Chapter 9 Question Answer offers comprehensive explanations of key concepts such as the nature of friction, its causes, types, and effects, providing a thorough understanding of this fundamental force in physics.
Class 8 Science Chapter 9 Friction Question Answers provide detailed and step-by-step solutions to clarify complex concepts involved in frictional forces, enhancing comprehension and retention.
Class 8 Science Chapter 9 Question Answer includes diagrams and illustrations that make learning about different types of friction more visual and easier to grasp.
Class 8 Science Chapter Friction Question Answer are aligned with the NCERT textbook, ensuring they cover all topics in the syllabus and follow the CBSE curriculum.
Class 8 Science Friction PDFs are prepared to help students in exam preparation by providing practice questions and answers.
Vedantu also offers additional study materials such as class notes, important concepts, and exemplar solutions to reinforce learning and ensure a solid grasp of the subject matter.
Conclusion
Vedantu’s Friction Class 8 NCERT PDF Questions and Answers offer a helpful guide for students to understand the concept of friction easily. The solutions provide clear explanations and step-by-step answers, aiding in grasping important concepts related to friction. Students must focus on understanding the factors affecting friction, its types, and practical applications in everyday life. Previous year question papers have typically included around 5–7 questions from this chapter, emphasizing the importance of thorough preparation. By utilizing Vedantu’s solutions, students can enhance their understanding, improve problem-solving skills, and achieve success in their examinations.
Important Study Material Links for Class 8 Science Chapter 9 Friction
NCERT Solutions for Class 8 Science - Chapter-wise Links
Other Important Links for Class 8 Science
FAQs on NCERT Solutions for Class 8 Science Chapter 9 Friction
1. Does friction only happen when an object is moving?
No, friction also acts on stationary objects; this is called static friction. It's the force you must overcome to start moving something, like pushing a heavy desk. Static friction is what prevents a book from sliding down a tilted table.
2. Does using the friction Class 8 NCERT Solutions PDF mean I'm not learning?
No, using the friction Class 8 NCERT Solutions PDF effectively is a smart study technique, not a shortcut. The common myth is that looking at a solution is cheating, but its real purpose is to guide and verify your own work.
The best method is to attempt all the friction class 8 questions and answers on your own first. After completing a problem, use the solutions to check your steps and final answer. This helps you pinpoint exactly where you made a mistake—for instance, maybe you confused static and sliding friction in an explanation.
3. Is friction always a bad or unhelpful force?
No, friction is often a necessary and helpful force. While it does cause wear and produces unwanted heat, we depend on it to walk without slipping, write on paper, and for car brakes to work. Many everyday actions would be impossible without it.
4. Is it true that a perfectly smooth surface has zero friction?
No, even a surface that appears perfectly smooth still has friction. This misconception occurs because we associate friction with obvious roughness, but on a microscopic level, all surfaces have tiny imperfections like hills and valleys called irregularities.
When two surfaces, like a glass slab and a wooden block, are in contact, these micro-level irregularities interlock. To make one surface slide over the other, you must apply force to break these interlocks. This resistance to movement is friction. This is why even a rolling ball on a polished floor eventually stops.
5. Do the NCERT solutions just give the final answer for each question?
No, a quality NCERT solution for class 8 science chapter 9 provides detailed, step-by-step explanations for every question. They are designed to show the correct scientific reasoning and method, not just the final result, helping you learn how to solve problems yourself.
6. Are the NCERT Solutions PDFs only for the end-of-chapter exercise questions?
No, comprehensive NCERT Solutions for Class 8 Science Chapter 9 cover more than just the final exercise questions. A common misunderstanding is that solutions are only for the list of questions at the very end of the chapter. Well-structured solutions, like those in the Vedantu Free PDF, also often include explanations for in-text questions and activities mentioned within the chapter. This ensures you understand the concepts as they are introduced, not just during the final review.
7. Is rolling friction stronger than sliding friction?
No, rolling friction is actually much weaker than sliding friction. This is why it is easier to roll a heavy suitcase with wheels than to drag it across the floor. The wheels reduce the contact area and the interlocking of surfaces.
8. Does friction only depend on the type of surface, like wood or glass?
No, the force of friction depends on two main factors: the nature of the surfaces in contact and how hard they are pressed together. The myth is that only the material's roughness matters. While the type of surface is important (e.g., rubber on concrete has more friction than steel on ice), the force pressing them together (the normal force) is equally critical.
9. Do I have to pay to get the friction class 8 NCERT PDF?
No, you can typically access the friction class 8 NCERT pdf for solutions for free from Vedantu. Reputable educational platforms provide these resources as a Free PDF download to help students study effectively without any cost, allowing for easy offline access on any device.
10. Are all questions in the Class 8 Science Chapter 9 question answer section equally important?
NCERT Solutions for Class 8 Science Chapter 9 are designed to cover the entire syllabus, but some question types are more frequently asked in exams. It's a myth that you should focus on just one type, like definitions, and ignore others. A balanced approach is best.
