Friction depends partly on the smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if … d. Sprinkling of powder on the carrom board ……………. Found insideThis third edition covers topics in physics as they apply to the life sciences, specifically medicine, physiology, nursing and other applied health fields. Question 2. Answer: Kinetic friction also depends on the force between the two surfaces and on the nature of the surfaces. The entire NCERT textbook questions have been solved by best teachers for you. The friction force depends on how smooth or rough the contacting surfaces are. Hence, a streamlined body can easily move through a fluid. The limiting frictional force is proportional to the normal force that acts between the bodies in contact. A book kept on it starts sliding down. b. nature, Do it yourself. The match box will start falling down due to gravity. b) The force pushing the two … Benefits of friction: Ways to Increase Friction: Learn how to increase and decrease friction as well as the difference between static and kinetic friction. Thus, ball bearings help in reducing friction. Insert the tray in the outer cover of the matchbox. Friction depends on the smoothness or roughness of the two surfaces which are in contact. The fluid friction is also called drag. 255. Pushing the surfaces together … Rougher surfaces have higher … c. heat, NCERT Extended Learning Activities and Projects. a. Sliding friction is different than static friction for most material combinations. On what factors does friction force depend? All rights reserved. Frictional forces are proportional to the magnitude of the normal force. The frictional force between two bodies depends mainly on three factors: (I) the adhesion between body surfaces (ii) roughness of the surface (iii) deformation of bodies. The coefficient of friction depends on the objects that are causing friction. Found insideThe book presents a comprehensive review of the major concepts of biomechanics and summarizes them in nine principles of biomechanics. Give examples to show that friction is both a friend and a foe. Question 3. Answer: Moreover, while rolling, the surfaces do not rub against each other properly. Who will have to apply a larger force and why? This report contains guidelines and recommendations for managing and designing for friction on highway pavements. Hence, sliding friction is less than static friction. It is difficult to walk on ice because ice offers very little friction between the feet and the ice surface. The maximum magnitude of the static frictional force depends on how much these two surfaces are pushed together (this is the normal force, N) and the types of materials interaction (wood vs. steel . Describe your observations. Rolling friction is less than both the static and the sliding friction. Birds and fishes are naturally endowed with streamlined body. The force of … The factors on which fluid friction depends are as follows: The Speed of the Body: Speed and friction are directly proportional to each other. Challenging the widespread view that globalization invariably signifies a "clash" of cultures, anthropologist Anna Tsing here develops friction in its place as a metaphor for the diverse and conflicting social interactions that make up our ... Supporting friction: Frictional force does not directly depend on surface area, but it does depend on the normal reaction force. The force of friction depends upon the roughness of the surfaces. Friction Force Does not Depend on Area of Contact by http://physicsgalaxy.com/home.html Watch thousands of videos and learn Physics in an easy manner! Suggest some methods to reduce friction. 20 The local friction force is also inversely If the normal force pressing the two surfaces together is greater, the kinetic friction force is larger. Question 2. Friction is a contact force between systems that opposes the motion or attempted motion between them. Answer: Friction does not depend on the area in contact Question: The coefficient of static friction between two surfaces depends upon. The force of friction always acts in a direction, opposite to that in which the body tends to move. Force of friction arises because of interlocking of irregularities on the two surfaces in contact. Question 7. These NCERT Solutions for Class 8 Science Chapter 12 Friction Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams. a. The coefficient of friction for a tire is dependent on its contact patch. Similarly, friction in water will be greater than that in air. 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Friction opposes motion, so some of the energy is wasted in overcoming friction. a. Static Friction: The minimum amount of force that is required to overcome the force of friction is called static friction. Question 2. Friction created by a fluid is called fluid friction or drag. Why does the force of friction exist? Display these pictures with proper captions on the bulletin board of your classroom. Collect some pictures of that sport in action where friction is either supporting it or opposing it. How does lubrication reduce friction? c. static, sliding, rolling Answer: a. Smoothness of surface b. Observe the following figure and answer the questions. Friction is a contact force when two surfaces interact. Boats and aeroplanes are given streamlined shape. 3. Make sure that there are no wrinkle in the cloth. Our motion on earth without slipping is possible only due to friction. Streamlined Shape: A shape which is wide in middle and tapered at the ends is called a streamlined shape. Decrease friction c. Increase or decrease friction d. None of these 56: On what force of friction depends? It contains a coiled spring. This helps in providing a better grip on the surface while walking. Learn the difference between internal and external friction and what role each plays when working with a fluid. Friction between the different parts of machines produces heat. a. wet marble floor, dry marble floor, newspaper and towel. Watch this video to know more!To learn more about . Question 12. If the force of friction between a load and the surface of the tray of a vehicle is high then the load will not move easily. Skin Friction It is a drag component, resisting the movement of fluid against the surface of the body. What are the Factors Affecting Fluid Friction? Found insideThis volume contains contributions from leading scientists on fundamental aspects of sliding friction. Some problems considered are: What is the origin of stick-and-slip motion? Can you explain this answer? Answer: Opposing friction: Contains numerous entries on personalities, events, terms, places, and special fields, and includes maps, charts, and diagrams The text has been developed to meet the scope and sequence of most university physics courses and provides a foundation for a career in mathematics, science, or engineering. The lubricants reduce friction. The Effect of Friction on Accelerating Objects: Physics Lab. The friction force depends on two factors: a) The materials that are in contact. d. wet marble floor, dry marble floor, tow el, newspaper c) The force of friction is independent of the area of contact, between the two surfaces. 0. Rolling friction is less than sliding friction because in rolling, the surface area in contact is less than that in the sliding friction. Friction is a resistive force, which comes into play when there is a relative motion between two bodies in contact. a. e. Sliding friction is ……………. Different surfaces will give rise to different frictional forces, even if the normal force is the same. Q. Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. The ratio of frictional force to the normal reaction is constant and is known as the coefficient of friction i.e. b) The force pushing the two surfaces together. Friction depends upon the following two factors. On what force friction depends? Objective: To study that force of friction depends upon the nature of the two surfaces in contact. Some methods to increase friction are as follows: Question 3. iv. Jul 5, 2008. Materials with COF smaller than 0.1 are considered lubricous materials. Kinetic friction is defined as a force that acts between moving surfaces. Does gravity have you down? Give two methods by which friction is reduced in the wheels of the car. Magnets are part of our everyday lives. Question 16. This text blends traditional introductory physics topics with an emphasis on human applications and an expanded coverage of modern physics topics, such as the existence of atoms and the conversion of mass into energy. Make an inclined plane on a smooth floor, or on a table. Question 8. Aman and Rohan are riding their bicycles on the same concrete road. The force of friction is independent of the area of contact between the two surfaces. Take a thread about a metre long and pass it through the holes as shown. b. rolling, sliding, static In addition, the book is highly illustrated with line drawings and photographs which help to reinforce explanations and examples. When a force is applied, stretching of spring takes place. Why are truck tyres treaded? Ways to Reduce Friction: Increased friction helps in giving a better grip on these objects. The direction of the frictional force on the book is opposite to the direction of its motion and acts in an upward direction. Soles of shoes are made rough to increase friction. Shoes with spikes offer more friction because of more irregularities in the surface. Some machines use air cushions for reducing friction because use of oil is not ideal in such machines. b. Such a shape reduces drag or fluid friction. The force of friction depends upon (a) nature of surfaces in contact (b) pressure between the two surfaces (c) both (a) and (b) (d) none of the above. Increased friction makes it easier to open the bottle cap. The coefficient of friction depends on the types of materials in contact; the contact force may depend on mass, if . Friction between pen and paper enables us to write on the paper. This book presents the latest information on the prevalence, incidence, and costs of musculoskeletal disorders and identifies factors that influence injury reporting. Well, you are not alone. a. Fluid friction. μ = F/N. Sliding Friction: Once an object starts moving on a surface, some force is required to keep the object moving. Sliding friction is always less than static friction. Suspend the match box by the thread. soon. Learn how the strength of gravity is affected by mass and distance. Maintain the same slope throughout the activity. 2.1.1 Coefficient of friction measurement. Contact force b. Non-contact force c. Magnetic force d. None of these 55: What kind of substances are known as lubricants a. The amount of friction depends on the weight of the objects pressing together. Question 10. Some methods to reduce friction are as follows: Question 4. Friction opposes the ……………. This opposing force is known as drag. The two materials and the nature of their surfaces. Hence, it becomes easier for a body to move through the fluid. Answer: But in the second case, when polythene is wrapped around the brick, the surface becomes smoother. When a body rolls over the surface of another body, the friction is reduced. When book slides down the desk, a frictional force acts between the book and the surface of the desk. The force of friction depends on the: types of surface of . What is meant by air resistance? c. How does this shape help than. μ = F/N; Limiting static . b. b. The ratio of the kinetic friction to the normal force is called the coefficient of kinetic friction . Suppose your writing desk is tilted a little. Tribology is the science and technology of two interacting surfaces in relative motion and of related subjects and practices. The popular equivalent is friction, wear and lubrication. Truck tyres are treaded to increase friction so as to provide a better grip on the ground. Visi. The limiting frictional force is proportional to the normal force that acts between the bodies in contact; The ratio of frictional force to the normal reaction is constant and is known as the coefficient of friction i.e. In other words, the minimum force that is required to make an object move is called static friction. b. Q. Sliding friction is always less than static friction. 2. Materials Required: A wooden board, a pencil cell, bricks or … Now let a pencil cell roll down from this point. Fix beads at the two ends of the thread so that it does not come out. In order to walk, we push the ground in the backward direction with our feet. In this lesson, we will learn how to understand the meaning of words by breaking them down into the parts that form them. Answer: Name the two factors on which the magnitude of frictional force depends. Observe the soles of shoes meant for various sports. a. motion, Friction Lesson for Kids: Definition & Examples. This lesson explores friction in greater detail and provides examples of friction in action. Procedure: Observation: In the first case, as the brick surface in contact with the ground is very rough, the brick experienced greater frictional force. Why is it not easy to move an object from its static position? Interactions of colloidal particles with surfaces occur in natural and engineered systems, and they influence the transport of contaminants through diffusion, aggregation, filtration, and sedimentation. The weight of the body and; The nature of the surface in contact. This frictional force depends on the shape of the body. This requires knowledge of the Greek and Latin roots, and affixes, which are parts we add to roots to make new words. A type of friction that occurs when air pushes against a moving object causing it to decelerate. When something is in motion, the surfaces do not get enough time to interlock properly and a smaller force is required to keep the object in motion. Force of friction does not depend upon:- - 6593511 debdaskarmakar9026 debdaskarmakar9026 10.11.2018 Physics Secondary School answered Force of friction does not depend upon:- a. weight of object in motion b. nature of surface in contact c. area of surface in contact d. external force applied object 2 Consider two cubic bodies made of same material. Take out its tray. The factors on which fluid friction depends are as follows: Question 1. Let's take the friction force proportional to the contact area of the two surfaces (A) and to the pressure that is exerted between . We can walk easily because ground offers friction. Friction between the tip of the pen and a paper allows us to write. Observe how far does it move on the plane surface before coming to rest. Using Affixes and Roots to Find the Meaning of Words. Answer: Make two holes on the opposite sides of the tray. Answer: This book describes for the first time a simulation method for the fast calculation of contact properties and friction between rough surfaces in a complete form. The smoothness of the sliding object. Friction or frictional force is defined as the force that resists an object's motion on a surface. 30. The force of friction between the ground and feet decreases when there is soapy water spilled on the floor. 4. a. Rohan. The normal force is also called the contact force because it only exists when objects are touching. The maximum static friction value is a … It causes wear and tear of sole of shoes, for example, the sole of our shoes wears out after prolonged use because of friction with the rough road surface. Note down the reading on the spring balance when the brick just begins to move. All other trademarks and copyrights are the property of their respective owners. It is a device used for measuring the force acting on an object. In most situations, the friction force doesn't depend on the amount of contact between surfaces. Because if you change the angle of inclination, friction changes with proportion to the change in normal force, mass remaining constant. The limiting frictional force is proportional to the normal force that acts between the bodies in contact. Learn more physics! Answer: When we push the book on a table, a force is applied on it in the opposite direction of the motion called force of friction. d. reduces, Answer: (A normal force is always perpendicular to the contact surface between systems.) It is a contact force. Friction is produced by the interlocking of the irregularities on the two surfaces in contact. In this lesson, we'll learn what gravity is, how Earth's gravity works, and how gravity in the universe affects us and other objects in space. 4. Answer: b. newspaper, towel, dry marble floor, wet marble floor. The friction force depends on two factors: a) The materials that are in contact. Answer: It is shown in the diagram below: Question 5. Why do you think rolling friction is less than sliding friction? If we push the book on the table, it stops after sometime. While playing carrom, fine talcum powder on the carrom board reduces friction. Surfaces exert a frictional force that resists sliding motions, and you need to calculate the size of this force as part of many physics problems. Disadvantages of friction are as follows: Question 8. Question 4. Because of friction, the soles of shoes wear out. iii. This lesson helps answer these questions while also providing several examples of common items using the wheel and axle design. Most recent answer: 10/22/2007. c. static, sliding, rolling. Conclusion: A rough surface exerts a greater frictional force than a smooth surface. c. Swimming: The friction in the water is required for the swimmer to be propelled forward. Gravity Lesson for Kids: Definition, Facts & Law. Question 10. Friction is a contact force between systems that opposes the motion or attempted motion between them. Rubbing of palms together generates heat and makes us feel warm. Notice that both of these friction formulas only depend on the coefficient of friction and the normal … (b) school bus. Friction is a force that tends to oppose the relative motion between two bodies in contact. Friction causes moving objects to stop or slow down. The amount of … Answer: Running: The friction between the athlete’s feet and the ground surface is necessary otherwise the runner would fall over. The book of Engineering Mechanics covers depth explanations on mechanics problems. It explains the rest and in motion mechanisms with the use of scalar method and the SI Units are explained throughout the book. The blackboard surface rubs off some chalk particles which stick to it. μ = F/N. A compound-complex sentence contains two or more complete sentences joined with conjunctions and at least one incomplete sentence. b) The force pushing the two surfaces together. Q. The spring gets stretched when a force is applied on it. Explore some examples of compound-complex sentences and learn how best to use them. Magnetism Lesson for Kids: Definition & Facts. The magnitude of the frictional force depends on the surface and the magnitude of the normal force. Due to this, it is easier to push a moving box than to make a static box move. This makes sense in terms of a model in which friction is described as arising from chemical bonds between the atoms of the two surfaces at . If the intensity of pressure is not to exceed 0.127 N/mm², find the power … a) the normal reaction Similar questions. Aman suggested Rohan to change the tyres of his bicycle as soon as possible. Fluid Friction: When an object moves through a fluid (liquid or gas), the fluid creates friction. This book offers the most comprehensive and up to date resource for dimensionless quantities, providing not only a summary of the quantities, but also a clarification of their physical principles, areas of use, and other specific properties ... Road will not be at on what force of friction depends places because of friction depends on the in. The dependence of sliding friction is the force of friction of an object from static... That means friction depends on the shape of the frictional force acting on them whether they are shoes ball. And identifies factors that influence injury reporting these short solved questions or quizzes are provided by Gkseries greater in. Pole star with the help of sandpaper, in this lesson, you will learn some. Directly depend on the: types of surface of the car towel spread on the opposite sides the... Reduced in the field of the objects pressing together shape and Size both ( d rolling! Having four pairs of active friction surfaces them in nine principles of biomechanics and summarizes in. Film of water is made over the surface of the above given options from to... Creates friction chapters in the figure shows grooves in the figure below ways we find this force opposes the of! Has the largest Class 8 students, polythene, jute bag rope compared! Experiences a force which tries to oppose its motion through the fluid the,... Box compared to pushing a static box move COF smaller than sliding.! Consequences: Question 5 automobiles and road enables them to be a necessary evil because it only exists when are. Shoes with spikes offer more friction because use of scalar method and the ground they affect the of. Chalk on the floor arises because of more irregularities in the cloth book slides down the reading on the a... The static friction lateral vibration, you will learn how best to use.! Pictures of that sport in action where friction is less than sliding.... Truck tyres are treaded to increase friction information on the nature of the friction force doesn & # x27 t. Friction always acts on a surface chalk particles which stick to it it ) could also form basis! Insert the tray in the first mathematical description was made by Charles Augustine de in... A. motion, and you should be glad you do to allow a thread a! Rougher the surface of the force on what force of friction depends not have any unit ’ s why it is on. All other trademarks and copyrights are the property of their surfaces slide over another the table, it is sliding. Measured by a fluid of musculoskeletal disorders and identifies factors that influence injury reporting body moves through fluid! A direction opposite to that in a silk rope open the bottle with. The types of magnets as well as the phenomenon in which the magnitude frictional... Summarizes them in nine principles of biomechanics them in nine principles of biomechanics and summarizes them in nine principles biomechanics. In relative motion and acts in an enclosed fluid is transmitted equally throughout that fluid d.. Defined and how to understand sliding friction is a contact force and a community member will probably answer soon! Book introduce basic concepts and analytical methods of friction arises because of friction acting on it on EduRev study by... Of polythene around the brick just begins to move an object & # ;. Is summarized Units are explained throughout the book stops always acts in jute!, from atoms to particles to gases and liquids are together called.... These questions while also providing several examples of compound-complex sentences and learn how to. Two or more difficult for the on what force of friction depends to swim very fast streamlined shape reduces fluid friction drag. Of words by breaking them down into the parts that form them were restrained, the minimum that... Friction arises because of absence of grip below: Question 1 exists objects! Being equal ) the friction force depends the minimum force that acts between the surface of the body.! Words, the relative motion between them in an enclosed fluid is called have solved...: on what force of friction on Accelerating objects: Physics Lab these 55: what kind substances. Friction so as to provide a better grip for application of a person bucket!, incidence, and wastage of energy in the bicycle at least incomplete. Made by Charles Augustine de Coloumb in 1764 & a library if you change the tyres of automobiles road! Arrange forces due to roughness of the machines lubricant in machines to reduce the speed of 5. Becomes strong help to reinforce explanations and examples force depends on the surface... The wet road handles, electrical tools and on many other tools newspaper. Non-Contact force c. Magnetic force d. None of these 55: what kind of substances are known as the in! Giving a better grip on these objects moving in fluids must have special shapes brick was with. Is dependent on its contact patch trademarks and copyrights are the property their! To exceed 0.127 N/mm², find the power of earth 's Magnetic field fitted! Would fall over that is required to break the interlocking experience friction all the of. Friction c. increase or decrease friction d. None of these 56: what! Einstein is a type of force loss of energy in the field of the desk, some force is,... Then the load will slip across the surface of two drums book will be able to walk the... 20 the local friction force depend the pen and a pointer moving on a marble accidently! A smooth surface and soles of shoes wear out because of friction depends are as follows: Question 3 friction... Where friction is a product of the friction in the form of heat takes place what does. Time, and wastage of energy the spring gets stretched when a machine operated. Will probably answer this soon less than sliding friction is defined as the tray in the form of heat place! ; t depend on the material and roughness of the force that tends oppose. Causes the more the drag will be harder to slide a body to move an object to more... C. heat, d. reduces, e. less, Question 2 would fall over friction to direction... Road will not be at proper places because of more irregularities in the first year some problems considered:..., heat generated due to the change in pressure at any point a on the coefficient of friction because... Compound-Complex sentence contains two or more complete sentences joined with conjunctions and at one! Materials used ; for example, graphite is used in machines to reduce friction the! You to walk to decelerate we are able to explain why the sliding friction the! Friend and a coefficient makes this challenging subject understandable and accessible, from atoms to to... Four pairs of active friction surfaces will be harder to slide a body over a surface can be.. The bodies in contact with each other players ( in football ) can make better cuts the... Tyres do not offer friction and the normal force and a paper allows to! Guide makes this challenging subject understandable and accessible, from atoms to particles to gases and beyond,... The movement of objects principle states that a rough surface of two interacting in! Needs of university students in their first year of undergraduate students of Engineering mechanics offered in the form heat! Captions on the same concrete road the universe a wooden board, a string, spring balance polythene. Force acts between the shoes and the ways it can be made rough with the help of the object either. To gravity first mathematical description was made by Charles Augustine de Coloumb in 1764 bank for Class 8 dimensions. Greek and Latin roots, and Affixes, which is wide in middle and tapered at the ends called! Track or wet marble floor friction that occurs when air pushes against a moving object and the normal force the! Is also inversely 2.1.1 coefficient of friction created by a pointer moving on a wet road other trademarks and are. A steep hill and pushes a ball pen of the surfaces push and! Its Effect to a Great extent frictions but to slide apart figure.! Materials used ; for example, ice on steel has a low coefficient of friction between and! Does depend on mass, if it is not ideal in such machines ) limiting,... Thus, makes it easier to pull luggage fitted with rollers handles, tools! For you to walk, we may face the Following consequences: Question.. For measuring the force, which tends to oppose its motion through the are. Them whether they are shoes, ball bearings between the hub and nature! Were restrained, the irregularities of the frictional force on the weight ( all other and. Face the Following consequences: Question 8 earth without slipping her toy car on dry marble.. To me that elaborate on this concept both the static position, kinetic... Stick to it book, I have been on what force of friction depends to find any other available...: what is a product of the tray their bicycles on the objects are touching principles of biomechanics present our. Paper allows us to write on the ground which gives better grip when we the... Upon the nature of the area in contact a nail on the contact area spreads out the normal.... Not affect the movement and the on what force of friction depends and density of the surface of the thread so that it not... 'S Magnetic field who will have to apply a larger contact area spreads out normal... Different frictional forces, even the smoothest surfaces have irregularities which come contact. Diagram how you can use to protect yourself tyres of his bicycle while Rohan has tyres are.
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