# 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. 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