Frictional Force: Friction is a force exerted by a surface against the motion of a body across its surface. These MCQ Questions on Force and Pressure Class 8 with answers pave for a quick revision of the Chapter … Choose the correct option. NCERT Solutions for Class 8 Science Chapter 11 MCQs. A batsman hits a cricket ball which then rolls on the level ground. ... Frictional Force. Suppose your writing desk is tilted a little. What is Friction? (b) shape of the object (c) nature of the fluid (d) all of the above It is the force that opposes the motion of one body over the surface of another body. Visit to learn more about the types and examples of Static Friction. Question 2. Also, learn the advantages and disadvantages of friction. 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. Answer: When an object rolls over a surface, the friction created is called rolling friction. (iv) Friction is applied when two surfaces in contact move relative to each other. 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. The class 8 Science chapter 12 Friction, discusses friction and various factor affecting it. Types of friction include kinetic friction, static friction, and rolling friction. Answer: Once an object starts moving on a surface, some force is required to keep the object moving. To stop a moving object, a force must act in the opposite direction to the direction of motion. The angle and position of the object affect the volume of frictional force. Area of contact of the two surfaces. Science Class 8 – Chapter 12- Friction – NCERT exercise solution (Question-Answer) is provided below. 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? Frictional force is the force created by two surfaces contacting and sliding against each other. 8th Class Science Force and Pressure ... Air exerts a frictional force on the falling body. For instance, if you push your book across your desk, the book will move. Learn Force definition, unit & types of Force with solved examples. Name factors on which force of friction depends. Static friction is the frictional force between the surfaces of two substances when they are not in motion with respect to each other. 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 1. Question 1. Relative speed of the surfaces. Frictional forces are affected by the texture of the surfaces and the amount of force pushing them together. 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. 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 the reason why your car comes to a standstill if you don’t press the accelerator. These forces are mainly affected by the surface texture and quantity of force requiring them together. The entire NCERT textbook questions have been solved by best teachers for you. The minimum force that is required to keep a moving object in motion at a constant speed is called sliding friction. Muscular force is the type of force wherein we use our physical strength to change the state of motion of an object. Test , Class 8, Science, CBSE- Friction. We can define Force as the push or pull of an object. 2), Normal forces (one object touching another). Example 1. Friction is a (a) non-contact force Question 1. Mention the direction of the frictional force acting on it. 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. 8. Filed Under: Class 8 , Force and pressure Tagged With: contact force , example of frictional force , example of muscular force , frictional force , muscular force Force is everywhere and it comes in a variety of sizes, directions, and type. 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. After covering a short distance the ball comes to rest. 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. Determine the net force. About Mrs Shilpi Nagpal. Force and Pressure Class 8 Science Chapter 11 as per NCERT Book used in CBSE and other Schools. The entire NCERT textbook questions have been solved by best teachers for you. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 8 Science Friction. There several different forms of frictional forces, such as dry friction and fluid friction. (ii) All types of surface like solid, liquid and air offer the force of friction. Frictional Force refers to the force generated by two surfaces that contacts and slide against each other. The ball stops due to (a) magnetic force (b) frictional force (c) gravitational force (d) muscular force Answer: (b) Question 2. Science In Everyday Life Solutions for Class 8 Science Chapter 10 Force And Friction are provided here with simple step-by-step explanations. Friction, force that resists the sliding or rolling of one solid object over another. This interlocking of surfaces gives rise to force of friction which opposes the motion of upper block A over the lower block B. Answer: The frictional force acts in the upward direction. 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. 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. Force of Friction: (i) Friction is the force which resists the relative motion of surfaces. In general, a frictional force exists between two bodies when they move in the same or opposite directions or they slide across each other. 2. Friction Class 8 MCQs Questions with Answers. F g is the gravitational force, F f is the frictional force, FN is a normal force. Draw a “Free-body Diagram”: draw the object, show all forces acting on that object as vectors pointing in the correct direction.