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Choose the correct option. Question 2. Filed Under: Class 8 , Force and pressure Tagged With: contact force , example of frictional force , example of muscular force , frictional force , muscular force Frictional forces provide the traction needed to walk without slipping, but they also present a great measure of opposition to motion. 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. done clear. Friction Class 8 MCQs Questions with Answers. Find the (1) frictional force (2) mechanical advantage (3) efficiency of the system. 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. Get the answers to these questions by revising the key concepts using our NCERT Solutions for CBSE Class 8 Science Chapter 12 Friction. Q8(NCERT): Suppose your writing desk is tilted a little.A book kept on it starts sliding down. Frictional Force: Friction is a force exerted by a surface against the motion of a body across its surface. The friction force always act in the direction opposite to applied force. NCERT Solutions for Class 8 Science Chapter 11 MCQs. A book kept on it starts sliding down. (ii) All types of surface like solid, liquid and air offer the force of friction. A batsman hits a cricket ball which then rolls on the level ground. Examples : Muscular force and Frictional Force. Rahul applies a force of 6 kgf to lift a 4 kg bucket from a well using a single fixed pulley. Area of contact of the two surfaces. (iv) Friction is applied when two surfaces in contact move relative to each other. Show the direction of frictional force acting on it. It is the force that opposes the motion of one body over the surface of another body. Draw a “Free-body Diagram”: draw the object, show all forces acting on that object as vectors pointing in the correct direction. 2), Normal forces (one object touching another). These MCQ Questions on Force and Pressure Class 8 with answers pave for a quick revision of the Chapter … To stop a moving object, a force must act in the opposite direction to the direction of motion. For instance, if you push your book across your desk, the book will move. 2. 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 frictional force is opposing the rotation of the wheels of your car. Frictional forces , Tension in a string , Gravitational Force (or weight = mg where g is 9.8 m/s. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Friction. upward direction. ... Frictional Force. Question 2. Frictional force is the force created by two surfaces contacting and sliding against each other. What’s the reason sports shoes have spikes? The force, which opposes the relative motion between two surfaces in contact is known as friction. There several different forms of frictional forces, such as dry friction and fluid friction. NCERT Solutions for Class 8 Science Chapter 12 – 2 Mark Questions and Answers. It is a contact force. Friction Class 8 Extra Questions Short Answer Type 1. Learn Force definition, unit & types of Force with solved examples. The force exerted by a charged body on another charged or uncharged body is known as The frictional force exerted by a fluid is called drag. Name factors on which force of friction depends. Write its construction and working with the help of diagram. D) The force acting on the body is in the direction of the fall. (iii) Friction force always applies in the opposite direction of movement. This interlocking of surfaces gives rise to force of friction which opposes the motion of upper block A over the lower block B. It … 8. The ball stops due to (a) magnetic force (b) frictional force (c) gravitational force (d) muscular force Answer: (b) Question 2. Friction is the reason why your car comes to a standstill if you don’t press the accelerator. 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). Also, learn the advantages and disadvantages of friction. The class 8 Science chapter 12 Friction, discusses friction and various factor affecting it. ... 7. Determine the net force. Friction, force that resists the sliding or rolling of one solid object over another. 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. What is Friction? We can define Force as the push or pull of an object. Answer: Once an object starts moving on a surface, some force is required to keep the object moving. Get Revision notes of Class 8 th Science Chapter 12 Friction to score good marks in your Exams. Show the direction of frictional force acting on it. Question 1. Question 1. Answer: When an object rolls over a surface, the friction created is called rolling friction. Types of friction include kinetic friction, static friction, and rolling friction. Frictional forces are affected by the texture of the surfaces and the amount of force pushing them together. Friction is a (a) non-contact force 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. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Friction. Question 1. Test , Class 8, Science, CBSE- Friction. The minimum force that is required to keep a moving object in motion at a constant speed is called sliding friction. Answer: Factors on which frictional force depends are : Nature of surface in contact. When your writing desk is tilted a little, a book kept on it starts sliding down. Static friction is the frictional force between the surfaces of two substances when they are not in motion with respect to each other. Relative speed of the surfaces. Science Class 8 – Chapter 12- Friction – NCERT exercise solution (Question-Answer) is provided below. 8th Class Science Force and Pressure ... Air exerts a frictional force on the falling body. Mention the direction of the frictional force acting on it. Force is everywhere and it comes in a variety of sizes, directions, and type. Science In Everyday Life Solutions for Class 8 Science Chapter 10 Force And Friction are provided here with simple step-by-step explanations. 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? In general, a frictional force exists between two bodies when they move in the same or opposite directions or they slide across each other. Example 1. Why does the force of friction occur? Question 4: What is rolling friction? Answer: Frictional force acts opposite to the movement of the book i.e. 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. The angle and position of the object affect the volume of frictional force. (b) shape of the object (c) nature of the fluid (d) all of the above These forces are mainly affected by the surface texture and quantity of force requiring them together. Answer: The frictional force acts in the upward direction. 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. Visit vedantu.com to learn more about the types and examples of Static Friction. Among the given surfaces, the towel offers the greatest frictional resistance to the rolling of the ball over it. About Mrs Shilpi Nagpal. Suppose your writing desk is tilted a little. The entire NCERT textbook questions have been solved by best teachers for you. 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. 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. Examples of Net Force. 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. After covering a short distance the ball comes to rest. Force and Pressure Class 8 Science Chapter 11 as per NCERT Book used in CBSE and other Schools. What is spring balance? F g is the gravitational force, F f is the frictional force, FN is a normal force. Question 1. 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. Assuming the additional force applied to be to overcome frictional force. Frictional Force refers to the force generated by two surfaces that contacts and slide against each other. 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