India's #1 AI TutorClass 8 · Science · Chapter 9

CBSE Class 8 Science — Friction: complete chapter guide

CBSE Class 8 Science Chapter 9 Friction demystifies the invisible force that affects every movement in our daily lives — from walking on the ground to writing with a pen. Friction is the force that opposes relative motion between two surfaces in contact. While we often think of friction as a hindrance, the NCERT Class 8 Science textbook reveals that life as we know it would be impossible without it. This chapter systematically explores the types of friction, the factors that govern its magnitude, and the ingenious methods engineers use to control it. For students preparing for CBSE Class 8 Science exams, mastering Chapter 9 Friction is essential not only for scoring well but also for building a strong conceptual base for mechanics in higher classes.

Your child's private AI tutor — trained on NCERT.

3-day free trial · ₹1 to start · Cancel anytime.

Start 3-day free trial →

Key takeaways

✓CBSE Class 8 Science Chapter 9 Friction introduces four distinct types: static, sliding, rolling, and fluid friction, each with unique characteristics.
✓Friction depends primarily on two factors — the nature of surfaces in contact (roughness) and the normal force (weight) pressing them together.
✓Static friction is always greater than sliding friction for the same pair of surfaces, which is why it is harder to start moving an object than to keep it moving.
✓Fluid friction occurs when objects move through liquids or gases and increases with the speed of the object and the density of the fluid.
✓Friction can be reduced through lubrication, polishing surfaces, using ball bearings, converting sliding to rolling friction, and streamlining shapes.
✓Real-world applications in CBSE Class 8 Science Chapter 9 Friction include vehicle braking systems, shoe sole design, and aerodynamic engineering.
✓The chapter carries 3–4 marks in the Class 8 Science annual exam, typically through one short-answer and one application-based question.

What is Friction? — Core Concept from CBSE Class 8 Science Chapter 9

Friction is defined in CBSE Class 8 Science Chapter 9 Friction as the force that opposes the relative motion or the tendency of motion between two surfaces in contact. When you try to push a heavy box across the floor, you feel resistance — that resistance is friction. The NCERT Class 8 Science textbook emphasizes that friction always acts parallel to the surfaces in contact and in the direction opposite to the motion or attempted motion. Friction arises because no surface is perfectly smooth at the microscopic level; even polished metal surfaces have tiny irregularities. When two surfaces are pressed together, these irregularities interlock, creating resistance. The chapter clarifies that friction is not a property of a single object but a property of the pair of surfaces in contact. The same wooden block will experience different amounts of friction on glass, sandpaper, and ice. Understanding this foundational definition is critical because every subsequent concept in CBSE Class 8 Science Chapter 9 Friction builds upon it. Students should note that friction is a contact force — it only exists when surfaces touch each other.

Friction opposes motion or the tendency of motion between surfaces
Acts parallel to the contact surface, opposite to the direction of motion
Arises from microscopic irregularities interlocking between surfaces
Depends on the pair of materials in contact, not on a single object
Classified as a contact force — requires physical touch between surfaces

Types of Friction — The Four Categories in NCERT Class 8 Science

CBSE Class 8 Science Chapter 9 Friction distinguishes four distinct types of friction based on the nature of motion and the medium involved. Static friction acts on objects at rest and prevents them from starting to move. It is self-adjusting — it increases up to a maximum value as the applied force increases. Sliding friction (also called kinetic friction) comes into play once an object starts moving and slides over another surface. The NCERT textbook demonstrates that sliding friction is always less than the maximum static friction for the same surfaces, explaining why it is harder to start pushing a box than to keep it moving. Rolling friction occurs when an object rolls over a surface, like a ball or a wheel. Rolling friction is significantly smaller than sliding friction, which is why wheels revolutionized transportation. Fluid friction is the resistance experienced by objects moving through fluids (liquids or gases). A swimmer feels fluid friction in water; an aeroplane experiences it in air. Each type plays a distinct role in CBSE Class 8 Science Chapter 9 Friction and requires different strategies for management.

Static Friction vs Sliding Friction — A Key Distinction in Class 8 Science Chapter 9

One of the most important concepts in CBSE Class 8 Science Chapter 9 Friction is understanding why static friction is greater than sliding friction. When an object is at rest, the microscopic irregularities on both surfaces have time to settle deeply into each other, creating stronger interlocking. The maximum static friction is the highest resistive force that must be overcome to initiate motion. Once the object starts moving, these irregularities do not have time to interlock as deeply, resulting in lower resistance — this is sliding friction. The NCERT Class 8 Science textbook uses the example of pushing a heavy carton: the initial push requires more effort than keeping it in motion. This difference has practical implications. Vehicle brakes rely on static friction between brake pads and wheels to stop effectively; if the wheels lock and start sliding, stopping distance increases because sliding friction is weaker. Understanding this distinction helps students solve numerical problems and application-based questions commonly asked in CBSE Class 8 Science exams.

Factors Affecting Friction — Surface Nature and Normal Force

CBSE Class 8 Science Chapter 9 Friction identifies two primary factors that determine the magnitude of friction between surfaces. The first factor is the nature of the surfaces in contact. Rougher surfaces produce more friction because their irregularities interlock more effectively. Sandpaper on wood creates much more friction than polished metal on glass. The NCERT textbook illustrates this with activities where students drag the same object over different surfaces and observe varying resistance. The second factor is the normal force, which is the perpendicular force pressing the two surfaces together. For objects on a horizontal surface, the normal force equals the weight of the object. Heavier objects press surfaces together more firmly, increasing friction. Importantly, CBSE Class 8 Science Chapter 9 Friction clarifies that friction does NOT depend on the area of contact (for solid surfaces) — a surprising fact for many students. A brick lying flat or standing on its edge experiences the same friction if the surfaces and weight remain unchanged. This is because increased area spreads the same weight over more space, reducing pressure but proportionally increasing interlocking points.

Nature of surfaces: Rougher surfaces produce greater friction due to more interlocking
Normal force (weight): Heavier objects create more friction by pressing surfaces together
Surface area does NOT affect friction for solid surfaces — only roughness and weight matter
Temperature can indirectly affect friction by altering surface properties in extreme cases
Presence of contaminants (dust, oil) changes effective surface roughness and friction

Fluid Friction — Movement Through Liquids and Gases in Class 8 Science

CBSE Class 8 Science Chapter 9 Friction dedicates substantial attention to fluid friction, the resistance experienced when objects move through liquids or gases. Unlike solid friction, fluid friction depends on several factors: the speed of the object (faster movement increases resistance), the shape of the object (streamlined shapes reduce resistance), and the density of the fluid (denser fluids like water produce more friction than air). The NCERT Class 8 Science textbook uses vivid examples: a swimmer feels the water pushing against their body, and cyclists feel wind resistance at high speeds. Fluid friction increases dramatically with speed — this is why cars consume more fuel at highway speeds and why falling objects eventually reach terminal velocity when air resistance balances gravity. The chapter explains that while fluid friction is generally less than solid friction, it becomes significant at high speeds or in dense fluids. Understanding fluid friction is essential for designing efficient vehicles, ships, and aircraft, making this section of CBSE Class 8 Science Chapter 9 Friction highly relevant to real-world engineering.

Reducing Friction — Practical Methods from NCERT Class 8 Science

CBSE Class 8 Science Chapter 9 Friction presents five key methods to reduce unwanted friction in mechanical systems. Lubrication involves applying oil, grease, or other lubricants between surfaces to create a thin fluid layer that reduces direct contact and converts solid friction into much lower fluid friction. Car engines use motor oil; door hinges use grease. Polishing surfaces makes them smoother, reducing the interlocking of irregularities — this is why polished floors are slippery. Using ball bearings converts sliding friction into rolling friction; bearings contain small metal balls that roll between surfaces, dramatically reducing resistance in wheels and machinery. Streamlining shapes reduces fluid friction by allowing fluids to flow smoothly around objects without creating turbulence. Birds, fish, aeroplanes, and modern cars all feature streamlined designs. Converting sliding motion to rolling motion by using wheels or rollers is perhaps the most historically significant friction-reduction technique. The NCERT textbook emphasizes that the choice of method depends on the application — lubrication for engines, streamlining for vehicles, ball bearings for rotating machinery. Understanding these methods is crucial for answering application-based questions in CBSE Class 8 Science Chapter 9 Friction assessments.

Lubrication: Oil or grease creates a fluid layer between surfaces, reducing direct contact
Polishing: Smoothing surfaces reduces irregularities and interlocking
Ball bearings: Convert sliding friction to rolling friction in rotating machinery
Streamlining: Aerodynamic shapes reduce fluid friction by minimizing turbulence
Using wheels: Replace sliding with rolling, cutting friction by 10–100 times

Advantages of Friction — Why We Need It According to Class 8 Science Chapter 9

While much of CBSE Class 8 Science Chapter 9 Friction focuses on reducing friction, the NCERT Class 8 Science textbook also highlights that friction is essential for many daily activities. Without friction, we could not walk — our feet would slip with every step, just as they do on ice. Writing with a pen or pencil depends on friction between the tip and paper; on a perfectly smooth, frictionless surface, no mark would be left. Vehicle brakes work entirely on friction between brake pads and wheels; without sufficient friction, stopping would be impossible. Nails and screws stay in walls because of friction; otherwise, they would slide out. Friction between our hands and objects allows us to grip and hold things. The chapter emphasizes that friction converts kinetic energy into heat, which can be useful — rubbing hands together warms them, and friction-based fire-starting techniques have been used for millennia. Understanding these advantages helps students appreciate that the goal is not to eliminate friction but to control it intelligently. CBSE Class 8 Science Chapter 9 Friction teaches that friction is neither purely good nor bad — it is a phenomenon to be understood and managed.

Walking and running depend on friction between shoes and ground
Writing requires friction between pen/pencil tip and paper
Braking systems rely on friction to stop vehicles safely
Nails, screws, and knots hold because of friction
Gripping objects with hands is possible due to friction
Friction generates heat, useful for warming hands or starting fires

Disadvantages of Friction — Problems Addressed in CBSE Class 8 Science

CBSE Class 8 Science Chapter 9 Friction also examines the drawbacks of friction that engineers and designers must address. Friction causes wear and tear on surfaces in contact — car tyres wear down, shoe soles thin out, and machine parts gradually degrade. This wear necessitates regular maintenance and replacement, adding to costs. Friction converts useful mechanical energy into heat, reducing the efficiency of machines. A significant portion of fuel energy in vehicles is lost to friction rather than contributing to motion. The heat generated by friction can damage machinery if not properly managed — engines require cooling systems precisely because friction generates so much heat. Friction also produces noise; squeaking hinges, screeching brakes, and rumbling bearings all result from friction. The NCERT Class 8 Science textbook explains that reducing unwanted friction through the methods discussed earlier improves efficiency, extends equipment life, and reduces energy consumption. Understanding both advantages and disadvantages gives students a balanced perspective on CBSE Class 8 Science Chapter 9 Friction and prepares them for questions that ask for comparative analysis.

NCERT Activities and Experiments in Class 8 Science Chapter 9 Friction

CBSE Class 8 Science Chapter 9 Friction includes several hands-on activities that help students observe friction principles directly. One key activity involves dragging a wooden block across different surfaces — polished wood, rough cardboard, and sandpaper — while measuring the effort required. Students discover that rougher surfaces produce more friction. Another activity examines rolling versus sliding friction by comparing the effort needed to drag a heavy box versus rolling it on pencil-round rollers. The dramatic difference demonstrates why wheels are so effective. A third activity explores fluid friction by dropping paper cones and flat sheets from the same height, showing how shape affects air resistance. The NCERT textbook also suggests rubbing hands together to feel the heat generated by friction and observing the wear patterns on shoe soles to understand friction's long-term effects. These activities are frequently referenced in exam questions, and students who have actually performed them can answer with concrete observations. Teachers often assess practical understanding through viva questions based on these NCERT activities during internal assessments.

Dragging a block across different surfaces demonstrates how roughness affects friction
Comparing dragging versus rolling the same object shows rolling friction is much less
Dropping streamlined and flat objects illustrates fluid friction and air resistance
Rubbing hands together demonstrates friction converting mechanical energy to heat
Examining worn shoe soles reveals long-term effects of friction on materials

Common Misconceptions About Friction in Class 8 Science

CBSE Class 8 Science Chapter 9 Friction addresses several misconceptions that students commonly hold. Many students incorrectly believe that friction depends on the area of contact — that a larger surface produces more friction. The NCERT textbook clarifies that for solid surfaces, only roughness and normal force matter; area does not directly affect friction. Another misconception is that friction always opposes motion. More accurately, friction opposes relative motion between surfaces; static friction actually enables motion by preventing slipping. Students sometimes think heavier objects always experience more friction, but friction depends on normal force, which can differ from weight on inclined surfaces or when other forces act vertically. Some believe that polished surfaces have no friction, but even highly polished surfaces have microscopic roughness and produce friction, just less than rough surfaces. The chapter also clarifies that while rolling friction is less than sliding friction, it is not zero — wheels still experience some resistance. Addressing these misconceptions explicitly helps students develop accurate mental models of friction, which is essential for solving problems correctly in CBSE Class 8 Science exams.

Misconception: Friction depends on contact area. Fact: Only roughness and normal force matter for solids.
Misconception: Friction always opposes motion. Fact: It opposes relative motion; static friction enables walking.
Misconception: Heavier objects always have more friction. Fact: Depends on normal force, not always equal to weight.
Misconception: Polished surfaces have no friction. Fact: They have less friction, but never zero.
Misconception: Rolling friction is zero. Fact: It is small but not zero; wheels still face resistance.

Friction in Real-World Applications — Engineering and Design

CBSE Class 8 Science Chapter 9 Friction connects theoretical concepts to practical engineering through numerous real-world examples. Automobile manufacturers design tyre treads with specific patterns to maximize friction with roads, especially in wet conditions, ensuring vehicles can accelerate, turn, and stop safely. Sports equipment design heavily considers friction — cricket bats have rubber grips to increase friction with hands, while bowling alley floors are polished to reduce friction and allow balls to glide. Shoe soles are engineered with different materials and patterns depending on use: running shoes have soft, high-friction soles for grip, while ice skates have hard, polished blades to minimize friction. Industrial conveyor belts use high-friction materials to prevent goods from slipping during transport. Aeronautical engineers obsess over streamlining aircraft to reduce air resistance (fluid friction), improving fuel efficiency and speed. The NCERT Class 8 Science textbook uses these examples to show students that understanding friction is not just academic — it is central to designing nearly every manufactured product. Questions asking students to apply friction concepts to real scenarios are increasingly common in CBSE examinations.

Solving Numerical Problems on Friction — Class 8 Science Exam Strategy

While CBSE Class 8 Science Chapter 9 Friction is primarily conceptual, students should be prepared for basic qualitative problems and comparative questions. Typical exam questions ask students to compare friction in different scenarios: 'Why is it easier to roll a suitcase than to drag it?' (rolling friction is less than sliding friction) or 'Why do kabaddi players rub their hands with soil?' (increases friction for better grip). Some questions present situations and ask students to identify the type of friction involved or suggest methods to increase or decrease it. For example, 'A heavy box needs to be moved across a warehouse floor with minimum effort. Suggest two methods and explain.' (Use rollers to convert sliding to rolling friction; apply lubricant to reduce friction between surfaces.) When approaching such questions, students should clearly identify the surfaces in contact, the type of motion or attempted motion, and the relevant type of friction. Explanations should reference the factors affecting friction — surface roughness and normal force — and connect to the methods of reduction or enhancement covered in CBSE Class 8 Science Chapter 9 Friction. Using correct terminology from the NCERT textbook demonstrates mastery and earns full marks.

How CBSETUTOR.ai Helps Master Class 8 Science Chapter 9 Friction

Parents looking to give their Class 8 student an edge in mastering CBSE Class 8 Science Chapter 9 Friction can explore CBSETUTOR.ai, a 24×7 AI tutor designed specifically for CBSE Classes 6–12. The platform has ingested every NCERT textbook, including the complete Class 8 Science curriculum, and can answer questions about friction with the same terminology and examples used in the official textbook. Students can upload photos of any NCERT exercise question or worksheet problem on friction, and the AI tutor provides step-by-step explanations tailored to the CBSE marking scheme. Unlike generic tutoring apps, CBSETUTOR.ai understands the specific structure of CBSE Class 8 Science exams — where Chapter 9 Friction typically appears as one short-answer question (2–3 marks) and one application-based question (3–4 marks). The platform offers a 3-day free trial with no card required, and after that runs at a flat ₹999 per month for all subjects across Classes 6–12. For a parent concerned that their child is not grasping why rolling friction differs from sliding friction, or struggling to apply friction concepts to real-world scenarios, having an AI tutor available at 10 pm on a Sunday can make the difference between confusion and clarity. The AI adapts explanations to the student's level, ensuring concepts from CBSE Class 8 Science Chapter 9 Friction are thoroughly understood, not just memorized.

24×7 availability means students can clarify friction doubts at any time, not just during school hours
Upload photo feature allows students to get help on specific NCERT exercise questions from Chapter 9
NCERT-aligned explanations use the same terminology and examples as the Class 8 Science textbook
Covers all CBSE classes (6–12) and subjects for a flat ₹999/month — no hidden costs
3-day free trial lets families test whether the AI tutor suits their child's learning style

Exam Preparation Tips for CBSE Class 8 Science Chapter 9 Friction

To excel in questions from CBSE Class 8 Science Chapter 9 Friction, students should follow a structured preparation approach. First, thoroughly read the NCERT textbook chapter, paying special attention to diagrams and activity descriptions — these are often the basis for exam questions. Create a comparison table of the four friction types with their characteristics and examples; visual organization aids memory. Practice explaining each method of reducing friction with a real-world example; exam answers score higher when they include concrete applications. Review all in-text and end-of-chapter questions in the NCERT Class 8 Science book, ensuring you can answer them without looking at the solutions. For application-based questions, practice identifying the type of friction in everyday scenarios: bicycle braking (static friction), skating (sliding friction), a falling parachute (fluid friction). Time yourself answering 2-mark and 3-mark questions to build speed for the exam. Make flashcards for key definitions — friction, static friction, sliding friction, rolling friction, fluid friction, streamlining — and test yourself regularly. Finally, connect concepts to personal experience; recalling how it feels to push a heavy box or walk on ice makes abstract concepts concrete and easier to remember during exams. Students who combine NCERT textbook reading with active practice of CBSE Class 8 Science Chapter 9 Friction questions typically score full marks on this topic.

Read the full NCERT chapter, including all activities and diagrams, at least twice
Create a comparison table of friction types with characteristics and examples
Practice answering all NCERT in-text and end-of-chapter questions without help
Explain each friction-reduction method with a specific real-world application
Make flashcards for key definitions and test yourself regularly
Time yourself answering sample questions to build exam speed and accuracy
Connect concepts to personal experiences to make them memorable

Frequently asked questions

How many marks does CBSE Class 8 Science Chapter 9 Friction carry in the annual exam?+

Chapter 9 Friction typically carries 3–4 marks in the CBSE Class 8 Science annual examination. This usually appears as one short-answer question (2–3 marks) asking about types of friction or factors affecting it, and one application-based question (2–3 marks) requiring students to apply friction concepts to real-world scenarios. Some schools include a practical viva component based on NCERT activities from this chapter.

My child gets confused between static and sliding friction. How can I help them remember the difference?+

Use a concrete physical analogy: ask them to push a heavy chair or table. Point out that the initial push (getting it to start moving) requires more effort — that is overcoming static friction. Once it is moving, less effort is needed to keep it going — that is sliding friction. The key memory aid: static friction acts on stationary objects and is stronger; sliding friction acts on moving objects and is weaker. Practicing this with actual objects at home makes the concept stick far better than just reading about it.

Does friction depend on the contact area between surfaces or not? My child's notes say different things.+

For solid surfaces, friction does NOT depend on contact area — it depends only on the nature of surfaces (roughness) and the normal force pressing them together. This is a counterintuitive fact explicitly taught in CBSE Class 8 Science Chapter 9 Friction. A brick lying flat or standing on its edge experiences the same friction if the weight and surface material remain unchanged. However, for fluid friction (air or water resistance), a larger cross-sectional area perpendicular to motion does increase resistance. Make sure your child distinguishes between solid friction and fluid friction when answering exam questions.

What is the difference between rolling friction and sliding friction? Why are wheels so important?+

Sliding friction occurs when one surface slides over another, with microscopic irregularities constantly catching and releasing. Rolling friction occurs when an object rolls, with only a small contact point touching at any instant, greatly reducing interlocking. Rolling friction is typically 10–100 times less than sliding friction for the same surfaces, which is why wheels revolutionized transportation. CBSE Class 8 Science Chapter 9 Friction emphasizes this difference because converting sliding to rolling motion (using wheels, rollers, or ball bearings) is one of the most effective friction-reduction strategies.

How should my child prepare for application-based questions from Chapter 9 Friction?+

Application-based questions ask students to apply friction concepts to real scenarios, like 'Why are tyres treaded?' or 'Why do athletes use spiked shoes?' Your child should practice identifying: (1) which surfaces are in contact, (2) what type of friction is involved, (3) whether more or less friction is desired, and (4) which method from the chapter applies. Create a habit of analyzing everyday situations — opening a jar lid, writing on paper, riding a bicycle — through the lens of CBSE Class 8 Science Chapter 9 Friction. This builds the analytical skill needed to tackle unfamiliar application questions in exams.

What are the main methods to reduce friction that my child should memorize for exams?+

The five key methods from CBSE Class 8 Science Chapter 9 Friction are: (1) Lubrication — applying oil or grease to create a separating fluid layer, (2) Polishing — smoothing surfaces to reduce irregularities, (3) Ball bearings — converting sliding to rolling friction in rotating machinery, (4) Streamlining — shaping objects to reduce fluid friction by minimizing turbulence, and (5) Using wheels or rollers — replacing sliding with rolling motion. Each method should be linked to at least one real-world example, such as lubricating door hinges, polishing floors, using ball bearings in bicycle wheels, streamlining cars for fuel efficiency, and using luggage with wheels.

My child struggles with explaining why friction is both useful and harmful. How should they structure such answers?+

Teach your child to use a two-column mental framework. Advantages: friction enables walking (grip between shoes and ground), writing (pen tip grips paper), braking (pads grip wheels), holding objects (grip between hands and objects), and generates useful heat (rubbing hands together). Disadvantages: causes wear and tear (tyres, soles, machine parts), wastes energy as heat (reduces machine efficiency), requires maintenance (lubrication, replacement), and produces unwanted noise (squeaking, screeching). For a 3-mark exam question on this topic from CBSE Class 8 Science Chapter 9 Friction, writing three advantages and three disadvantages with one-line examples for each typically earns full marks.

What is fluid friction, and why is it different from other types of friction?+

Fluid friction is the resistance experienced when objects move through liquids or gases. Unlike solid friction (static, sliding, rolling), fluid friction increases dramatically with speed and depends on the shape of the object and the density of the fluid. A swimmer in water and a cyclist in air both experience fluid friction. CBSE Class 8 Science Chapter 9 Friction explains that streamlining (teardrop shapes) reduces fluid friction by allowing smooth flow without turbulence. This is why aeroplanes, cars, boats, and even birds and fish have streamlined shapes. Understanding fluid friction is essential for explaining phenomena like terminal velocity and fuel consumption at high speeds.

Are the NCERT activities from Chapter 9 Friction important for exams, or can my child skip them?+

The NCERT activities are very important and should NOT be skipped. CBSE examiners frequently ask questions directly referencing these activities, such as 'Describe the activity to compare friction on different surfaces' or 'What did you observe when comparing rolling and sliding friction?' If your child has actually performed the activities, they can answer with specific observations and earn full marks. If the school has not conducted these activities, at least read through them carefully in the textbook and understand the conclusions. Additionally, practical viva questions during internal assessments often come directly from these NCERT activities in CBSE Class 8 Science Chapter 9 Friction.

How is friction related to the wear and tear of objects? Should my child include this in answers?+

Yes, connecting friction to wear and tear demonstrates deeper understanding. Friction causes surfaces in contact to rub against each other, gradually wearing them down. Car tyres lose tread, shoe soles thin out, and machine parts degrade due to continuous friction. This is why lubrication (oil in engines) and replacement of worn parts are necessary. When answering questions about the disadvantages of friction or the need for lubrication in CBSE Class 8 Science Chapter 9 Friction, mentioning wear and tear with a concrete example (like tyres wearing down from road friction) shows application of concepts and typically earns additional marks.

What is the relationship between friction and heat? Why does rubbing hands together warm them?+

Friction converts mechanical energy into heat energy. When you rub your hands together, the sliding friction between your palms opposes the motion and converts the kinetic energy of your moving hands into thermal energy, warming them. CBSE Class 8 Science Chapter 9 Friction explains that this energy conversion is why friction reduces the efficiency of machines — energy intended for useful work is lost as heat instead. In some cases, the heat generated by friction can be so intense it causes fires, which is why fire-starting techniques involve rubbing sticks together. Your child should be able to explain this energy transformation in exam answers about friction's effects.

If my child is weak in CBSE Class 8 Science Chapter 9 Friction, will it affect their understanding in Class 9 and 10?+

Yes, friction is a foundational concept in mechanics that appears extensively in Class 9 (Force and Laws of Motion) and Class 10 (various motion chapters). Understanding friction in Class 8 builds the base for analyzing forces, calculating net force, and understanding motion on inclined planes in higher classes. If your child struggles with the basic concepts now — types of friction, factors affecting it, methods of reduction — they will find the more mathematical treatment in Class 9–10 challenging. Investing time to master CBSE Class 8 Science Chapter 9 Friction thoroughly now (through NCERT reading, practice questions, and perhaps additional support from platforms like CBSETUTOR.ai) will pay dividends in future physics chapters.

Related resources

Important Questions: CBSE Class 8 Science Chapter 9 Friction Class 8 Science Chapter 9 Friction — Formulas & Key Points CBSE Class 8 Science Chapter 9 Friction Worksheet with Answers महत्वपूर्ण प्रश्न: CBSE कक्षा 8 विज्ञान अध्याय 9 घर्षण AI Tutor for Class 8: The Smart Alternative to Tuition AI Tutor for Class 8 Science: Learn Faster with Instant Help Online Class 9 Science Tutor in Mumbai – 24/7 CBSE-Aligned AI Coaching CBSE Class 9 Mathematics — Number Systems: complete chapter guide

Keep learning — related guides

Class 8Science

CBSE Class 8 Science Chapter 13 Light: mind map & revision

Class 8Science

CBSE Class 8 Science — Light: complete chapter guide

Class 8Science

NCERT Solutions for CBSE Class 8 Science Chapter 13: Light

Class 8Science

CBSE Class 8 Science Chapter 13 Light — Notes

Class 8Science

CBSE Class 8 Science Chapter 12 Some Natural Phenomena: mind map & revision

Class 8Science

CBSE Class 8 Science — Some Natural Phenomena: complete chapter guide

Ready to give your Class 8 child the tutor that never sleeps?

CBSETUTOR.ai covers every chapter in the Class 8 NCERT syllabus — Maths, Science, Social Science, English, Hindi and more. 24×7. Patient. Unlimited. 3-day free trial.

Start your child's 3-day free trial →