The angle and position of the object affect the volume of frictional force. Show the direction of frictional force acting on it. Question 1. The class 8 Science chapter 12 Friction, discusses friction and various factor affecting it. (iv) Friction is applied when two surfaces in contact move relative to each other. Answer: Frictional force acts opposite to the movement of the book i.e. It is a contact force. Examples of Net Force. Example 1. Muscular force is the type of force wherein we use our physical strength to change the state of motion of an object. We can define Force as the push or pull of an object. The minimum force that is required to keep a moving object in motion at a constant speed is called sliding 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. 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. Show the direction of frictional force acting on it. Our notes of Chapter 12 Friction are prepared by Maths experts in an easy to remember format, covering all syllabus of CBSE, KVPY, NTSE, Olympiads, NCERT & other Competitive Exams. Also, learn the advantages and disadvantages of friction. The entire NCERT textbook questions have been solved by best teachers for you. Force and Pressure Class 8 Science Chapter 11 as per NCERT Book used in CBSE and other Schools. Get the answers to these questions by revising the key concepts using our NCERT Solutions for CBSE Class 8 Science Chapter 12 Friction. upward direction. Friction Class 8 MCQs Questions with Answers. Filed Under: Class 8, Friction Tagged With: disadvantages of fluid friction, drag, examples of drag force, fluid, fluid friction, methods of reducing fluid friction, streamlined shape. Since frictional force arises when the surface of two objects are in touch with each other ,therefore, frictional force is an example of contact force. (b) shape of the object (c) nature of the fluid (d) all of the above Suppose your writing desk is tilted a little. The frictional force exerted by a fluid is called drag. Question 2. These forces are mainly affected by the surface texture and quantity of force requiring them together. Science Class 8 – Chapter 12- Friction – NCERT exercise solution (Question-Answer) is provided below. Visit vedantu.com to learn more about the types and examples of Static Friction. When your writing desk is tilted a little, a book kept on it starts sliding down. Examples : Muscular force and Frictional Force. What is Friction? Force is everywhere and it comes in a variety of sizes, directions, and type. Among the given surfaces, the towel offers the greatest frictional resistance to the rolling of the ball over it. These MCQ Questions on Force and Pressure Class 8 with answers pave for a quick revision of the Chapter … NCERT Solutions for Class 8 Science Chapter 11 MCQs. What is spring balance? 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. Question 4: What is rolling friction? Frictional Force refers to the force generated by two surfaces that contacts and slide against each other. 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. The ball stops due to (a) magnetic force (b) frictional force (c) gravitational force (d) muscular force Answer: (b) Question 2. The friction force always act in the direction opposite to applied force. F g is the gravitational force, F f is the frictional force, FN is a normal force. Learn Force definition, unit & types of Force with solved examples. Frictional force is the force created by two surfaces contacting and sliding against each other. Answer: The frictional force acts in the upward direction. done clear. The entire NCERT textbook questions have been solved by best teachers for you. 8th Class Science Force and Pressure ... Air exerts a frictional force on the falling body. The frictional force is opposing the rotation of the wheels of your car. Friction is the reason why your car comes to a standstill if you don’t press the accelerator. ... 7. (iii) Friction force always applies in the opposite direction of movement. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Friction. Friction, force that resists the sliding or rolling of one solid object over another. Write its construction and working with the help of diagram. D) The force acting on the body is in the direction of the fall. The force exerted by a charged body on another charged or uncharged body is known as It … Find the (1) frictional force (2) mechanical advantage (3) efficiency of the system. This interlocking of surfaces gives rise to force of friction which opposes the motion of upper block A over the lower block B. To stop a moving object, a force must act in the opposite direction to the direction of motion. 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. Choose the correct option. Frictional Force: Friction is a force exerted by a surface against the motion of a body across its surface. Types of friction include kinetic friction, static friction, and rolling friction. For instance, if you push your book across your desk, the book will move. There several different forms of frictional forces, such as dry friction and fluid friction. 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. Friction is a (a) non-contact force Force of Friction: (i) Friction is the force which resists the relative motion of surfaces. 2. Filed Under: Class 8 , Force and pressure Tagged With: contact force , example of frictional force , example of muscular force , frictional force , muscular force 2), Normal forces (one object touching another). Why does the force of friction occur? Frictional forces are affected by the texture of the surfaces and the amount of force pushing them together. 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 provide the traction needed to walk without slipping, but they also present a great measure of opposition to motion. Question 1. A batsman hits a cricket ball which then rolls on the level ground. About Mrs Shilpi Nagpal. Rahul applies a force of 6 kgf to lift a 4 kg bucket from a well using a single fixed pulley. Static friction is the frictional force between the surfaces of two substances when they are not in motion with respect to each other. Answer: Once an object starts moving on a surface, some force is required to keep the object moving. ... Frictional Force. What’s the reason sports shoes have spikes? Question 2. In general, a frictional force exists between two bodies when they move in the same or opposite directions or they slide across each other. Test , Class 8, Science, CBSE- Friction. 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. Friction Class 8 Extra Questions Short Answer Type 1. A book kept on it starts sliding down. 8. Answer: Factors on which frictional force depends are : Nature of surface in contact. Determine the net force. Question 1. Relative speed of the surfaces. The force, which opposes the relative motion between two surfaces in contact is known as friction. Draw a “Free-body Diagram”: draw the object, show all forces acting on that object as vectors pointing in the correct direction. Answer: When an object rolls over a surface, the friction created is called rolling friction. Name factors on which force of friction depends. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Friction. (ii) All types of surface like solid, liquid and air offer the force of friction. Q8(NCERT): Suppose your writing desk is tilted a little.A book kept on it starts sliding down. NCERT Solutions for Class 8 Science Chapter 12 – 2 Mark Questions and Answers. 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). Get Revision notes of Class 8 th Science Chapter 12 Friction to score good marks in your Exams. It is the force that opposes the motion of one body over the surface of another body. Area of contact of the two surfaces. 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. 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