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