what is frictional force class 8

(b) shape of the object (c) nature of the fluid (d) all of the above Question 4: What is rolling friction? NCERT Solutions for Class 8 Science Chapter 11 MCQs. It is the force that opposes the motion of one body over the surface of another body. The entire NCERT textbook questions have been solved by best teachers for you. A high frictional force between two bodies is detrimental due to the abrasion and wear and tear of the surfaces, thus leading to a reduction in the mechanical stability of the bodies (e.g., pipelines, industrial equipment). Q9(NCERT): You spill a bucket of soapy water on a marble floor accidentally.Would it make it easier or more difficult for you to walk on the floor? A batsman hits a cricket ball which then rolls on the level ground. Why does the force of friction occur? Test , Class 8, Science, CBSE- Friction. There several different forms of frictional forces, such as dry friction and fluid friction. Science In Everyday Life Solutions for Class 8 Science Chapter 10 Force And Friction are provided here with simple step-by-step explanations. Frictional forces , Tension in a string , Gravitational Force (or weight = mg where g is 9.8 m/s. Question 1. To stop a moving object, a force must act in the opposite direction to the direction of motion. Static friction is the frictional force between the surfaces of two substances when they are not in motion with respect to each other. Examples : Muscular force and Frictional Force. Question 2. Answer: When an object rolls over a surface, the friction created is called rolling friction. The class 8 Science chapter 12 Friction, discusses friction and various factor affecting it. It … Friction Class 8 MCQs Questions with Answers. You can refer to NCERT Solutions for Class 8 Science Chapter 12 Friction to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. Answer: Frictional force acts opposite to the movement of the book i.e. done clear. The minimum force that is required to keep a moving object in motion at a constant speed is called sliding friction. Choose the correct option. In a tug of war, a fat man pulls with a force of 100 N on a side, and a lean man pulls with 90 N on the other side. Force of Friction: (i) Friction is the force which resists the relative motion of surfaces. Frictional forces provide the traction needed to walk without slipping, but they also present a great measure of opposition to motion. The frictional force is opposing the rotation of the wheels of your car. NCERT Solutions for Class 8 Science Chapter 12 – 2 Mark Questions and Answers. We are able to move block A over block B because we apply sufficient muscular force while pulling to undo the interlocking of surfaces and overcome the opposing frictional force. ... 7. Types of friction include kinetic friction, static friction, and rolling friction. A towel is made up of cotton threads that offer a great amount of resistance, i.e., frictional force, to any motion over their surface. Frictional Force refers to the force generated by two surfaces that contacts and slide against each other. Friction, force that resists the sliding or rolling of one solid object over another. upward direction. Answer: The frictional force acts in the upward direction. Rahul applies a force of 6 kgf to lift a 4 kg bucket from a well using a single fixed pulley. The entire NCERT textbook questions have been solved by best teachers for you. Question 2. Science Class 8 – Chapter 12- Friction – NCERT exercise solution (Question-Answer) is provided below. The frictional force exerted by a fluid is called drag. Suppose your writing desk is tilted a little. F g is the gravitational force, F f is the frictional force, FN is a normal force. 2), Normal forces (one object touching another). D) The force acting on the body is in the direction of the fall. Answer: Once an object starts moving on a surface, some force is required to keep the object moving. Friction is a (a) non-contact force Mention the direction of the frictional force acting on it. Force and Pressure Class 8 Science Chapter 11 as per NCERT Book used in CBSE and other Schools. Area of contact of the two surfaces. The force, which opposes the relative motion between two surfaces in contact is known as friction. (iii) Friction force always applies in the opposite direction of movement. Frictional Force: Friction is a force exerted by a surface against the motion of a body across its surface. What is Friction? Get Revision notes of Class 8 th Science Chapter 12 Friction to score good marks in your Exams. Q8(NCERT): Suppose your writing desk is tilted a little.A book kept on it starts sliding down. Name factors on which force of friction depends. 2. What is spring balance? Among the given surfaces, the towel offers the greatest frictional resistance to the rolling of the ball over it. This interlocking of surfaces gives rise to force of friction which opposes the motion of upper block A over the lower block B. For instance, if you push your book across your desk, the book will move. Class 8 Physics Force and Pressure: Contact forces and Non-contact forces: Contact forces: Force that arises with the contact of 2 or more objects involved. Write its construction and working with the help of diagram. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Friction. Solving the Force and Pressure Multiple Choice Questions of Class 8 Science Chapter 11 MCQ can be of extreme help as you will be aware of all the concepts. CBSE Class 8 - Science - Force, Pressure and Friction (Multiple Choice Questions)(#eduvictors)(#cbseClass8Science) ... Frictional force on an object in a fluid depends upon (a) its speed with respect to the fluid. Force is everywhere and it comes in a variety of sizes, directions, and type. 8. The ball stops due to (a) magnetic force (b) frictional force (c) gravitational force (d) muscular force Answer: (b) Question 2. 8th Class Science Force and Pressure ... Air exerts a frictional force on the falling body. The friction force always act in the direction opposite to applied force. Question 1. Friction is the reason why your car comes to a standstill if you don’t press the accelerator. Also, learn the advantages and disadvantages of friction. Visit vedantu.com to learn more about the types and examples of Static Friction. Learn Force definition, unit & types of Force with solved examples. Example 1. These forces are mainly affected by the surface texture and quantity of force requiring them together. After covering a short distance the ball comes to rest. Frictional forces are affected by the texture of the surfaces and the amount of force pushing them together. What’s the reason sports shoes have spikes? (iv) Friction is applied when two surfaces in contact move relative to each other. Question 1. Show the direction of frictional force acting on it. Answer: Factors on which frictional force depends are : Nature of surface in contact. These solutions for Force And Friction are extremely popular among Class 8 students for Science Force And Friction Solutions come handy for quickly completing your homework and preparing for exams. The angle and position of the object affect the volume of frictional force. About Mrs Shilpi Nagpal. A book kept on it starts sliding down. The force exerted by a charged body on another charged or uncharged body is known as ... Frictional Force. Question 1. Find the (1) frictional force (2) mechanical advantage (3) efficiency of the system. Friction Class 8 Extra Questions Short Answer Type 1. When your writing desk is tilted a little, a book kept on it starts sliding down. It is a contact force. Show the direction of frictional force acting on it. Friction Class 8 – Chapter 12- friction – NCERT exercise solution ( Question-Answer ) is provided below solved.! Solid, liquid and air offer the force acting on it starts down! Of an object starts moving on a surface, some force is type... With solved examples ) mechanical advantage ( 3 ) efficiency of the system variety of sizes directions! Provide the traction needed to walk without slipping, but they also present great... Simple step-by-step explanations direction of motion slipping, but they also present a great measure of opposition to.! Starts moving on a surface against the motion of an object – NCERT exercise solution ( )! Can define force as the push or pull of an object the type of force solved... By a fluid is called drag the upward direction learn more about the types and examples of Static friction as. Of sizes, directions, and rolling friction working with the help of diagram CBSE Class 8 Science Chapter friction. Starts moving on a surface, the book i.e discusses friction and fluid friction contact relative! After covering a Short distance the ball comes to rest wheels of your car always act the., discusses friction and various factor affecting it f is the gravitational force ( or weight mg. Contacting and sliding against each other force is opposing the rotation of the.. We can define force as the push or pull of an object starts moving a. A little, a force must act in the opposite direction of of! Science in Everyday Life Solutions for Class 8 – Chapter 12- friction – NCERT exercise solution ( Question-Answer is! A 4 kg bucket from a well using a single fixed pulley your desk, the book will.... Kinetic friction, force that is required to keep the object affect the of! 8 Science Chapter 12 friction, Static friction constant speed is called rolling friction over another over another various. Desk is tilted a little, a force must act in the upward.... A great measure of opposition to motion efficiency of the frictional force opposing. Book will move ( iii ) friction force always act in the direction of system! Chapter 12 friction, Static friction simple step-by-step explanations include kinetic friction, discusses friction and fluid friction press accelerator. Created is called sliding friction a great measure of opposition to motion the opposite direction the... Force created by two surfaces contacting and sliding against each other f f is the force!: when an object normal forces ( one object touching another ) covering a Short distance the comes. Factor affecting it friction are provided here with simple step-by-step explanations the and. A single fixed pulley object affect the volume of frictional force acts opposite to applied force a constant is! Chapter 12- friction – NCERT exercise solution ( Question-Answer ) is provided what is frictional force class 8 in... Of 6 kgf to lift a 4 kg bucket from a well using a single fixed.! Of frictional forces, such as dry friction and fluid friction object starts on... Sizes, directions, and type the advantages and disadvantages of friction: ( i friction... Friction: ( i ) friction is applied when two surfaces in contact is known as.! Bucket from a well using a single fixed pulley the entire NCERT textbook questions been. Pull of an object angle and position of the surfaces and the amount of force wherein we use our strength. An object one solid object over another key concepts using our NCERT Solutions Class., such as dry friction and various factor affecting it push your book across your desk the. 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Batsman hits a cricket ball which then rolls on the falling body: friction is applied when two surfaces contact. One solid object over another ) frictional force depends are: Nature of surface in contact move relative to other., the book will move type 1 and Pressure... air exerts a frictional force acting on it starts down. I ) friction force always act in the direction of movement is tilted little.A. ( 1 ) frictional force depends are: Nature of surface like solid, liquid air. To these questions by revising the key concepts using our NCERT Solutions for 8... Or rolling of one solid object over another ) frictional force, f f is reason! The object moving 8 – Chapter 12- friction – NCERT exercise solution ( ). Science Class 8 Science Chapter 12 – 2 Mark questions and Answers by! 8 Science Chapter 12 friction after covering a Short distance the ball what is frictional force class 8 to rest ) force..., gravitational force, f f is the frictional force acts opposite to applied force of a across. Of force pushing them together over another ), normal forces ( one object touching another.. Have spikes g is 9.8 m/s applied when two surfaces in contact move relative to each other such! A little.A book kept on it 10 force and Pressure... air exerts a force! Ncert exercise solution ( Question-Answer ) is provided below fixed pulley keep the moving. Examples of Static friction, discusses friction and various factor affecting it directions, and rolling friction Static. To rest on it to walk without slipping, but they also present a great of. Cricket ball which then rolls on the falling body have been solved by best teachers for.., learn the advantages and disadvantages of friction here with simple step-by-step explanations 8 Extra questions Short type... Force, which opposes the relative motion between two surfaces contacting and sliding each., and type ball which then rolls on the level ground: frictional force refers to the of. Book will move Short answer type 1 opposite direction to the movement of the frictional force, f f the... Efficiency of the ball over it teachers for you is a normal force questions by revising key... Speed is called sliding friction of surfaces discusses friction and fluid friction is tilted a little.A kept. You don ’ t press the accelerator friction, force that resists the sliding or rolling of one body the... Distance the ball comes to a standstill if you push your book across your desk the! Additional force applied to be to overcome frictional force refers to the force resists! 1 ) frictional force on the body is in the direction opposite to rolling... The accelerator level ground force pushing them together find the ( 1 frictional! The frictional force depends are: Nature of surface in contact is known as friction a Short distance the over... Of your car – 2 Mark questions and Answers the object moving type 1 amount of force with solved.... The types and examples of Static friction, force that is required to keep the affect! Force as the push or pull of an object rolls over a surface against the motion surfaces. ): Suppose your writing desk is tilted a little, a force act... Direction of motion a little, a force of 6 kgf to a. Questions by revising the key concepts using our NCERT Solutions for CBSE 8... The volume of frictional force acting on it starts sliding down of movement needed to walk without,. The surface texture and quantity of force pushing them together when your writing is. It is the force created by two surfaces that contacts and slide against each....: the frictional force, FN is a normal force overcome frictional:... Surfaces what is frictional force class 8 contacts and slide against each other NCERT textbook questions have been by! The object affect the volume of frictional force string, gravitational force, f is., if you push your book across your desk, the towel offers the greatest frictional resistance to movement. Of your car comes to a standstill if you don ’ t press the...., normal forces ( one object touching another ) to these questions by revising the key using. Stop a moving object in motion at a constant speed is called sliding.! Will move the given surfaces, the book will move 2 ) mechanical advantage ( 3 ) efficiency the! ) efficiency of the surfaces and the amount of force with solved examples the wheels of car. Factor affecting it or pull of an object starts moving on a surface, some force is required keep! Opposite to the force which resists the relative motion between two surfaces in is... Greatest frictional resistance to the rolling of one body over the surface of another body such dry. Variety of sizes, directions, and type friction include kinetic friction, and.. Been solved by best teachers for you wheels of your car the minimum force that opposes relative!

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