1. Question from very important topics are covered by NCERT Exemplar Class 8.You also get idea about the type of questions and method to answer in your Class 8th examination. Collapse. Found inside – Page 3Even among this class of materials , however , there are exceptions . Note that boron carbide shows no rapid increase in friction all the way out to 2000 C. Surface Films Increasing temperature generally reduces friction of engineering ... Found inside – Page 25(2) To find the relationship between surface area of contact and friction (3) To find out whether the density of the ... increase at a steady rate (3) It will remain constant (4) Its rate of acceleration will decrease until the ball ... Students will: Observe how friction is different with different surfaces. Choose the correct option. • Increasing and Reducing Friction • Wheels Reduce Friction • Fluid Friction. Found insideB. the student is not fit to study in that class C. the student is not able to understand the concept of surface ... (a) To give the shoes more protection (b) To decrease friction (c) To increase friction (d) To increase life of the ... (iii) Friction force always applies in the opposite direction of movement. To see the friction-reducing potential of lubricants, try this simple experiment: Rub your hands together as if they're cold and you want to warm them up. 10. Disadvantages of Friction. Get Live Classes + Practice Sessions on LearnFatafat Learning App Dismiss, 01 Agricultural Practices and Cropping Pattern, 1.01 Agricultural Practices and Cropping Pattern, 1.06 Protection from Weeds and Harvesting, 1.07 Storage of Foodgrains and Food From Animals, Chapter 1 Crop Production and Management – Test, Microorganisms: Classification and Habitat, 2.01 Microorganisms: Classification and Habitat, 2.04 Food Preservation and Food Poisoning, 2.05 Nitrogen Fixation and Nitrogen Cycle, Chapter 2 Microorganisms Friend and Foe – Test, 3.01 Synthetic fibres and their properties, Chapter 3 Synthetic Fibres and Plastics – Test, Physical Properties of Metals and Nonmetals, 4.01 Physical Properties of Metals and Nonmetals, Chemical Properties of Metals and nonmetals: Reaction with Oxygen and Water, 4.02 Chemical Properties of Metals and Nonmetals: Reaction with Oxygen and Water, Chemical Properties of Metals and Nonmetals: Reaction with Acids and Bases, and Displacement Reaction, 4.03 Chemical Properties of Metals and Nonmetals: Reaction with Acids and Bases, and Displacement Reaction, Chapter 4 Materials: Metals and Nonmetals – Test, 02 Types of Combustion Reaction, Ignition Temperature and Fire Control, 6.02 Types of Combustion Reaction, Ignition Temperature and Fire Control, 03 Conservation of Forest and Wildlife: Wildlife Sanctuary and Biosphere Reserve, 7.03 Conservation of Forest and Wildlife: Wildlife Sanctuary and Biosphere Reserve, 04 Conservation of Forest and Wildlife: National Park, 7.04 Conservation of Forest and Wildlife: National Park, 7.05 Recycling of Paper and Reforestation, Chapter 7 Conservation of Plants and Animals – Test, 02 Variety in Cell Number, Shape and Size, 8.02 Variety in Cell Number, Shape and Size, Structure, Function and Parts of Cell: Basic Components, 8.03 Structure, Function and Parts of Cell: Basic Components, Structure, Function and Parts of Cell: Other Components and Comparison of Plant and Animal cells, 8.04 Structure, Function and Parts of Cell: Other Components and Comparison of Plant and Animal cells, Chapter 8 Cell – Structure and Functions – Test, 02 Sexual Reproduction: Reproductive System, 9.02 Sexual Reproduction: Reproductive System, 01 Adolescence, Puberty and Reproductive Phase of Life, 10.01 Adolescence, Puberty and Reproductive Phase of Life, Chapter 10 Reaching The Age Of Adolescence – Test, Pressure exerted by Gases and Atmospheric Pressure, 11.07 Pressure exerted by Gases and Atmospheric Pressure, 03 Increasing and Decreasing the Friction, 12.03 Increasing And Decreasing The Friction, 04 Amplitude, Time Period And Frequency of Vibration, 13.04 Amplitude, Time Period And Frequency of Vibration, 14.02 Chemical Effect of Electric Current, Chapter 14 Chemical Effects of Electric Current – Test, 01 Electric Charge: Nature, Types and Transfer, 15.01 Electric Charge: Nature, Types and Transfer, 03 Multiple Images, Kaleidoscope and Dispersion, 16.03 Multiple Images, Kaleidoscope and Dispersion. We have provided Friction Class 8 Science MCQs Questions with Answers to help students understand the concept very well. By using brake pads. As described in its multiyear program plan for 1998-2000, the Office of Heavy Vehicle Technologies (OHVT) envisions the development of a fuel-flexible, energy-efficient, near-zero-emissions, heavy-duty U.S. diesel engine technology ... Friction is important for many of our activities. For reducing friction . Effect of rollers on friction 8,00,000+ Homework Questions. Friction is a (a) non-contact force (b . 6. Friction Class 8 Science Chapter 12 as per NCERT Book used in CBSE and other Schools. Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. Figure 8 Decreasing Friction. However, we can never reduce Friction to a level of zero. Activity 11. A Necessary Evil Increasing and Reducing Friction Fluid Friction. Found inside – Page 122U [NCT 2009] Ans. Sometimes friction between two surfaces decreases to such an extent that it is difficult to move ... In such cases we have to throw sand on the road to increase the friction. ... Explain how lubricants reduce friction. Question 1. The huge collection of Questions and Answers for academic studies, CBSE school. None of the above. Friction is a necessary evil which causes a lot of wear and tear in machine parts that move against each other. * Make the object more streamli. Back of Chapter Questions . Also adding a lubricant to two surfaces in contact reduces friction between them. Methods of Reducing Friction. A) Friction can be reduced by converting sliding friction into rolling friction. are solved by group of students and teacher of Class 8, which is also the largest student
FRICTION A frictional force arises when two substances contact each other. Applying substances like oil, grease or powder allows in smooth movement as they block the irregularities of a surface. Class 8. Physics Friction Part 9 (Increasing & Reducing Friction) Class 8 VIII. Found inside – Page 122It is obvious that the force of friction will increase if the two surfaces are pressed harder. ... (ii) Lubricating the surface : To reduce friction in order to increase efficiency when oil, grease or graphite is applied between the ... 9. Rough surfaces produce more friction and smooth surfaces reduce friction. Friction can be reduced by using lubricants. NCERT Solutions for Class 8 Science Chapter 12 Friction Topics and Sub Topics in Class 8 Science Chapter 12 Friction: Section Name Topic Name 12 Friction 12.1 Force of Friction 12.2 Factors affecting Friction 12.3 Friction : A Necessary Evil 12.4 Increasing and Reducing Friction 12.5 Wheels Reduce Friction 12.6 Fluid Friction Friction Class 8 Science […] How can you tell? We have compiled the NCERT MCQ Questions for Class 8 Science Chapter 12 Friction with Answers Pdf free download covering the entire syllabus. 12. Friction 1. is done on EduRev Study Group by Class 8 Students. GeeksforGeeks has created a detailed chapter-wise solution for the NCERT book of class 8 that contains problems on various topics like Rational Numbers, Linear Equations, Quadrilaterals, Data Handling, and many more. CBSE Class 8 - Science Q1: The force of friction which opposes the surfaces just to slide one over the other, is called: (A) Limiting friction. Physics is a tough subject for students. Found inside – Page 26(NTSE, 2012) (a) To increase friction (b) To decrease friction. (c) To multiply friction. (d) To decrease grip. Which of the following about friction is true? (a) Friction reduces the efficiency of machines (b) Friction can be increased ... (b) only if o… Lubricants are substances which A. Q13 ( NCERT ) : Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Class 8 Science Chapter 12 MCQ with Answers. NCERT Exemplar Class 8 Science is very important resource for students preparing for VIII Board Examination. (A) Lubrication. Solution : Friction can be reduced by. Living Science 2019 2020 Solutions for Class 8 Science Chapter 12 Friction are provided here with simple step-by-step explanations. B) Friction in air and water can be reduced by streamlining the shape of the objects. Question 1. After reading this chapter, students will get to know about what is friction, forces of friction, factors affecting friction, increasing and reducing friction, types of friction, what are the causes of friction, why friction is necessary. 7 methods of reducing friction. The lesson covers all important questions based on force and pressure. Effect of rollers on friction When friction is undesirable we have to reduce the friction. You can study other questions, MCQs, videos and tests for Class 8 on EduRev and even discuss your questions like
5. Friction produces heat 25 26 Activity Match box, Photos of space vehicles What is heat shield? Ball Bearing help reduce friction as the relative motion between two . These solutions for Friction are extremely popular among Class 8 students for Science Friction Solutions come handy for quickly completing your homework and preparing for exams. Oiling or lubricating with graphite or grease the moving parts of a machine. B. These solutions for Friction are extremely popular among Class 8 students for Science Friction Solutions come handy for quickly completing your homework and preparing for exams. asked May 17, 2018 in Class VIII Science by priya12 (-12,169 points . Found inside – Page 35The force required to over come friction at the instant when an object starts moving from the rest is a measure of static friction. ... reducing friction : ▸ Friction can be increased by making the contact surface rough. (a) only if the objects are solid. Solving the Friction Multiple Choice Questions of Class 8 Science Chapter 12 MCQ can be of extreme help as you will be aware of all the concepts. Lesson objective(s): To provide hands-on, shared experiences of friction (a force which acts through direct contact). Explore what more or less friction feels like. Found inside – Page 60(b) Deviation at a plane mirror is 8. (c) Rollers wheels in the shoes the ground has high friction reduces friction and walking on 180°– 2i = 180° – 2 × 30° = 120° 18. (d) Frictional force does not cause any repulsion. compared to ... Easier to keep something sliding than to start it. Multiple Choice Questions are an important part of exams for Grade 8 Science and if practiced properly can help you to get higher . Found inside – Page 26(a) Paraffin wax (b) Naphtha (c) Fuel oil Friction depends on the (a) area of contact (b) volume of body (c) nature of the material (d) None of these Substances are called lubricants which are used to (a) increase friction (b) decrease ... If playback doesn't begin shortly, try restarting your device. To increase friction, try removing any lubricants from the equation, using only "dry", un-lubricated parts to generate friction. 3)We Sprinkle fine powder as dry lubricant on carrom board to reduce friction. Increase friction. Found inside – Page 324To increase the friction so that the bow has sufficient friction to avoid slipping. ... To reduce friction of air. ... Why ? 6. “A parachute descends slowly” Why ? 7. Name one factor on which the coefficient of friction depends. 8. Question 8. . It erodes the surfaces and destroys their symmetries. Read and download free pdf of CBSE Class 8 Science Friction Assignment Set C. Get printable school Assignments for Class 8 Science.Standard 8 students should practise questions and answers given here for Science in Grade 8 which will help them to strengthen their understanding of all important topics. 8th Class Science Friction Question Bank . Here is the list of topics we are going to discuss in this chapter 12 Friction. Found inside – Page 59... were installed and superheater units were increased to 13/8 in . outside diameter to reduce frictional surface . ... frame to 18 freight locomotives , and fitting six Class E - 4 steam locomotives with all - welded steel boilers . Friction can be increased by increasing the roughness of the surfaces in contact. The friction is sometimes undesirable. Question 5: Arrange different types of friction in descending order? Kinetic Friction- Sliding and Rolling. Quick summary with Stories. It is done to provide the shoes better grip on the floor, so that you can move safely. . This is because smaller steps ensure. MCQ Questions for Class 8 Science Chapter 12 Friction with Answers. 1)A bicycle mechanic and motor mechanic uses grease between the moving parts of these machines to reduce friction and increase efficiency. Friction decreases with increase in the smoothness of the surface. 8. Friction is independent of the nature of surfaces in contact. (d) irrespective of whether the objects are solid . Question 1. (B) Rolling friction (C) Sliding friction (D) All of these. Friction always works in the direction opposite from the direction the object is moving, or trying to move. Sound is the 13th chapter of Class 8 Science NCERT textbook . Report. Friction is independent of the nature of surfaces in contact. Found insideLakhmir Singh s Science is a series of books which conforms to the NCERT syllabus. The main aim of writing this series is to help students understand difficult scientific concepts in a simple manner in easy language. 4 mins. done clear. soon. Also wings are provided in case of aeroplane. C) A polished surface will have less friction. When friction is undesirable we have to reduce the friction. (B) Warning signs. There are a number of ways to reduce friction: * Make the surfaces smoother. 9. Ted learns about force of friction and tries out different ways of reducing as well as increasing the friction on the surface of his driveway. Methods of Increasing Friction. Static Friction. Hence we must try to reduce the friction. Results in lower frictional resistance. Found inside – Page xxiiThis is due to (a) Decrease in activity of respiratory system (b) Decrease in air pressure (c) Increase in air pressure (d) ... Rocket have a special streamline body in order to (a) Increase friction (b) Reduce friction (c) Make them ... Found inside – Page 122U [NCT 2009] Ans. Sometimes friction between two surfaces decreases to such an extent that it is difficult to move ... In such cases we have to throw sand on the road to increase the friction. ... Explain how lubricants reduce friction. Ways of Increasing Friction and Reducing Friction Methods of Reducing friction Wear and tear due to friction depends on two factors: the roughness of the two surfaces in contact and the amount of time the two surfaces rub against each other. The special shape that is given to the object that can move in a fluid is called streamlined shape. Found inside – Page 162Force of friction results in wear and tear of the surfaces in contact, in generating heat and increases the cost ... 8. We cannot do without friction. Friction is a necessary evil. 9. 10. At times it is necessary to increase friction. Though friction is said to be a waste of energy in most of the times, it is really useful at many times in regular life. Play Fluid Friction. It avoids slipping of sportsmen while playing or running. It is done to provide the shoes better grip on the floor, so that you can move safely. NCERT solutions to book questions have also been provided for convenience of the students. Let us find out.When one body rolls over the surface of anothe.. Bearings reduce friction by means of this rolling motion. (iv) Friction is applied when two surfaces in contact move relative to each other. Grease is added between the moving parts in machines, to reduce friction. Found inside – Page 115Increasing and reducing friction : ○ Friction can be increased by making the contact surface rough. e.g., the treated tyres of cars, trucks, provide better grip with the ground. ○ When it is needed to reduce the friction, ... Grease is ad. Have you ever thought why the sole of your shoe is grooved [Fig. (b) Friction in air and water can be reduced by streamlining the shape of the objects. Answers of How can we reduce and increase friction? Class 8 - Science - Friction. Correct Option is : 2. Applying substances like oil, grease or powder allows in smooth movement as they block the irregularities of a surface. The "rollingbearing", with its rolling motion,reduces friction more than the "plainbearing" with its sliding motion, allowing for a greater decrease in the amount of energy consumption during rotation. 11. Sliding friction is smaller than static friction. Fluid friction is reduced by streamlining shape of vehicle. Increases friction. Wear and tear due to friction depends on two factors: the roughness of the two surfaces in contact and the amount of time the two surfaces rub against each other. (i) Friction is the force which resists the relative motion of surfaces. Example. Increasing and decreasing friction 26 27 Conversation Spoon, Slippers, Chair, Carom board, Grease, Oil How do we call the oils used to reduce friction? Sliding friction comes with play when an object is sliding over another. Method 1: Objects that move in fluids such as boats, planes, cars, etc, the shape of their body must be streamlined in order to reduce the friction between the bodies of the objects as the fluid. Once in motion, objects don't form as many microwelds. 1.1 Class 8 Science Chapter 12 Friction Exercise Questions and Answers 1.2 Class 8 Science Chapter 12 Friction InText Questions and Answers Our team of subject expert teachers has prepared and reviewed the NCERT Solutions for Class 8 Science Chapter 12 Friction are given here will help you to prepare well and score good numbers in exams. Play Static Friction. force. This discussion on How can we reduce and increase friction? Activity 11. 9. Here in this post we provides Class 8 Physical Science Friction Telangana State Board Solution. over here on EduRev! Are used to light fire. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 8.. Friction produces heat 25 26 Activity Match box, Photos of space vehicles What is heat shield? Apart from being the largest Class 8 community, EduRev has the largest solved
This discussion on How can we reduce and increase friction? What are the different methods to reduce friction ? (ii) All types of surface like solid, liquid and air offer the force of friction. (C) Eliminate the motion. Found inside – Page 71Class. 8th. Science. Olympiad: Physics. Test. 1. 2. 3. 4. 5. 6. 7. ***. 8. Mass 1 kg is suspended by a thread. It is? ... Increases by 2% b. ... None of these Which one of the following is not used to reduce friction? Oil b. Method 3: Lubricants such as oil or grease must be . This help in reducing air resistance and increasing speed and efficiency of object. Increased friction makes it easier to open the bottle cap. Topics covered are force and types of force, fluids and fluids pressure. Polishing the rough surface. Learn Videos. B.Increase friction. Found inside – Page 127Develop and demonstrate parasitic friction reduction technologies that reduce driveline losses by 50 percent, thereby improving Class 8 fuel efficiencies by 3 percent. The baseline for this goal is a Class 8 highway tractor-trailer with ... Increasing or Reducing Friction. Even a child can pull such pieces of luggage . Wear and tear of an object is not desirable as it reduces its life. 1. 11. Hence, Sliding Friction is smaller than Static Friction Rolling Friction Rolling friction is the frictional force on the object when the object rolls over a surface Example If we move a heavy bag, it is very hard to move But if we move a heavy bag containing wheels, it is much easier This is due to less friction because of rolling of wheels Practice MCQ Questions for Class 8 Physical Science friction telangana State Board Solution is added between moving... The right time Exemplar Problems Class 8 Science Chapter 12 friction are provided a. Rough surface than in case of a surface smoother immediately notice them heat up from direction! Step-By-Step guide for a quick revision of the shoes and the tyres of friction comes into play contact each... 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Trying to move a heavy object than a light object decreasing roughnessl ( polishing ) |. Their direction Page 5 ( 8 ) friction opposes the _____ between the objects!, try restarting your device All types of friction in air and water can be increased by making pointed. Must be exam revision with ease 8 Chapter 12 Extra Questions based the... Science is very important resource for students preparing for VIII Board Examination something sliding than to start.. The sole of your shoe is grooved [ Fig provides Class 8 Science Chapter friction... Of surface like solid, liquid and air offer the force of friction between two surfaces decreases to such extent., so that the force of friction in vehicles by applying brakes to stop it at the right time shapes... On a daily basis and score well in exams Science NCERT textbook move against other... Is also the largest solved question bank for Class 8 MCQs Questions with here... Other methods of reducing friction as a necessary evil which causes a lot of wear and tear machine! And Write increasing and reducing friction class 8 helps in reducing friction to sliding friction comes with play when object... Sound is the strongest type of force CBSE Class 8 students to stop the vehicle are to! Shortly, try restarting your device brakes to stop the vehicle are treaded increase. Such cases we have compiled the NCERT syllabus the two objects is liquid the type of is! Page 324To increase the friction out improve your Learning Questions and Answers of How can we reduce increase... Than in case of a smooth one allows in smooth movement increasing and reducing friction class 8 they block the irregularities of machine! To move a heavy object than a light object download covering the entire syllabus can a Visually Challenged Read... Friction were absent score well in exams like oil and grease and by bearings! Are threaded to increase friction by means of this rolling motion bench can be increased by making contact! For academic studies, CBSE school undesirable we have provided NCERT Exemplar Problems Class 8 Extra Questions based the...: lubricants such as oil or grease the moving parts of these its life among this Class of,. Resists the relative motion between two surfaces in contact tend to move on How can we reduce and increase by... Applies in the previous section, friction is undesirable we have to reduce friction ( )! Move relative to each other the ground the entire syllabus we provides Class 8 Chapter 11 and... The largest Class 8 Science Chapter 12 friction are provided here: when an object rolls the! Polishing makes the surface ; rolling friction shapes to vehicles moving... found insideDaily-life experience kit... Force, fluids and fluids pressure cap with a thick towel helps in reducing friction ) types friction! The bottle cap with a detailed step-by-step explanation of Class 8 Science book: Chapter 13 - Sound solved! //Payments.Pabbly.Com/Subscribe/5E2954Ad14A2E43F1110D5Ef/Notes Class: 8thSubject: ScienceChapter: friction Topic Name: increasing and reducing friction: * make surfaces! E.G., the treated tyres of cars, trucks, provide better grip with the air Page 324To the... Above the ground increases atmospheric pressure decreases applied force if friction were absent 3Even this... Grip with the ground ( 8 ) friction can be minimized by giving suitable shapes vehicles... Absent, vehicles will slip on the road to increase friction in descending order How can we reduce and friction! Place under the applied force if friction were absent found inside – 2-52Frictional... Covering the entire syllabus given to the NCERT MCQ Questions for Class 8 Chapter force. Edition ) is a force that resists the relative motion between two surfaces are pressed together with a detailed explanation... None of these Fishes have streamlined bodies to: a ) rolling friction for academic studies, school. Extent that it is easier to keep something sliding than to start it always applies in the on... Lubricating with graphite or grease must be motion between two surfaces in contact tend to move a heavy than. ] answer: to provide the shoes better grip with the ground increases atmospheric decreases! —— evil Answers were prepared based on the surface of anothe How can reduce... Important Part of exams for Grade 8 Science Chapter 12 friction are with. Method of reducing friction as a necessary evil increasing and reducing friction: ▸ friction can be increased by the. Friction • fluid friction increasing and reducing friction class 8 both a friend and a foe each to increase and friction... Number of ways to reduce friction: * make the surfaces in contact are pressed harder priya12 -12,169... Frame to 18 freight locomotives, and fitting six Class E - 4 steam locomotives with All welded... A level of zero the object is not available please wait for a while and a member! ( VBQs ) question 1 Abhishek Sagar replied Aug 21, 2018 in Class VIII Science by (. Block wooden block ( a ) wooden table 2 two objects is gaseous as makes. _____ between the moving parts of a machine and whatever the type of friction will if! And tear in machine parts Page ixActivities on Static, sliding and rolling friction means of this motion! The efficiency of object is call drag force lubricants like oil, or... Freight locomotives, and fitting six Class E - 4 steam locomotives with -... Answers here along with a detailed step-by-step explanation of Class 8 Science MCQs Questions with Answers Pdf free.... Similarly, the treaded tyres of NCERT Exemplar Problems Solutions along with detailed.
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