Graphite can be used in machines which reach a very high temperature. You spill a bucket of soapy water on a marble floor accidently. (b), Question 8. (a) wet marble floor, dry marble floor, newspaper and towel. (d) none of these Answer: As result, the spaceship gets heated to red hot. It can be concluded that rolling friction is smaller than the sliding friction. (b), Question 5. surface of only lower object exerts frictional force on the upper object. (d) turpentine oil Answer: Rolling friction is less than sliding friction. Answer: Question 2. It is made of medium carbon steel, quenched and tempered. (c) rolling friction Friction is a friend in the following ways — it helps us to walk, to write on the blackboard and to apply the brakes of a car. Question 8. The reason for this difference could be that in the first case, since the brick surface in contact with the ground is rough, the surface gets greater force of friction. In cars, the friction is increased by using brake pads in the brake system. Some points are given below which show that friction is both a friend and a foe: Question 10. Yes, fluids also exert friction. (a) Friction opposes the ______ between the surfaces in contact with each other. After sliding for some time, the book stops. Why ? Answer: Question 10. Learn more about Barrett's estophagus, including symptoms and causes. While ... How to Change Oil Friction generates heat, for e.g., between the parts of machinery. The selection of the class to be used is in accordance with the technical requirements for the application for which the pump is intended. Put a tick mark on the correct choice : (b) static friction Answer: Ships and boats have a streamlined shape to reduce friction with air. Why do meteors bum on entering the atmosphere ? The oil should be at the center of the "hot" area of the tip. Fluids is the common name given to gases and liquids. Gaurav went to the market on his bicycle. Question 5. The brake pads do not touch the wheels but when we press the brake level, these pads arrest the motion of the run due to friction and the wheels stop moving. Friction, that exists between two surfaces in contact, when there is no relative motion between them, is called Question 4. The easiest way to replace the additives is with an oil change. By wrapping a piece of jute bag around the brick, it is observed that the reading of spring balance is more than the second It helps to minimise the speed or to stop any moving object. He found that he had to apply a lot of force while pedalling. Question 4. Question 12. Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Criteria for fragrance-free products. The pencil cell covers different distances on different surfaces Repeat this activity by spreading a thin layer of sand over the table. Once your ears have healed from the initial piercing, purchase a set of ear tapers at a piercing studio. Who will have to apply a larger force and why? Four children were asked to arrange forces due to rolling, static and sliding frictions in decreasing order. The distance covered by the pencil cell is different every time because of the different amounts of friction provided by different surfaces. Explain why sliding friction is less than static friction. As the surface of the table provides the frictional force to oppose the sliding • of the book. (c) viscous drag The wheels of the car are provided with ball bearings along the axle which reduce the friction. (b), Question 4. Answer: The ball will stop after sometime because the force of friction is acting from the opposite direction. Answer: Name some lubricants and where they are used. This "shearing" process reduces the effectiveness of each job the transmission fluid must accomplish. (c) to make them look attractive Choose the correct arrangement. Pull the brick by a spring balance (Fig. Do you think that resistance to the motion of the book has been reduced? Repeat this activity by wrapping a piece of jute bag around the brick. Answer: (a) marble tiles Fill in the blanks. Why does the force of friction exist ? Note down the reading on the spring balance when the brick just begins to move. It produces hurdles in moving any object freely. Dry marble floor, wet marble floor, towel, newspaper. It produces translucent formulas without electrolytes. It would be more difficult to walk on the floor with soapy water because when we walk on a soapy floor, there is little friction between the floor and the feet, so it becomes difficult to walk. We draw here on the National Statistics Socio-Economic Classification (NS-SEC), where Classes 1 and 2 denote professional and managerial occupations and Classes 6 and 7 working-class occupations. Answer: GERD is the reflux of acidic fluid from the stomach into the esophagus, and is classically associated with heartburn. (c) limiting friction A Class 10.9 bolt can be identified simply by the numbers 10.9 on it. Medications, bowel habits, foods you eat, and laxatives all can cause occasional constipation. Place them parallel to each other on a table. However, it should be noted that many people only define themselves in terms of class when pressed to choose a class identity (see Savage, 2007). Friction depends on the ………….. of surfaces. How far does it move on the table before coming to rest? Soles of shoes are grooved so as to provide better grip between the shoes and the ground. Activity 4 (NCERT Textbook, Page 152) (d), Question 6. The force of friction between the car and different surfaces in increasing order will be : Answer: (a) they look smart Question 8. surfaces of both the objects exert force in a direction opposite to each other. For example, in the United States, a 65-year-old white woman of mean height and weight7 without major risk factors has a 10-year FRAX risk of MOF of 8.4%.4, 8 … Close the door to avoid people walking in at inopportune times. Answer: Would it make easier or more difficult for you to walk on the floor ? Suppose your writing desk is tilted a little. Question 1.3 Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% dioxygen by mass. Activity 3 (NCERT Textbook, Page 147-148) Why ? [NCERT] Answer: Make an inclined plane on a smooth floor, or on a table. Wet marble floor, dry marble floor, newspaper and towel. Video length: (10:20) - Uploaded by ionut27gj - Starring: Hot amateurs gone wild in this Anal Sex, Couple video. From Safer Choice Standard Section 3.9 (pg. (b) limiting friction (a) rolling, static, sliding (c) towel, newspaper, dry marble floor, wet marble floor. The function of the ridges is to increase the friction. Keep your E-Class' transmission healthy by changing the automatic transmission fluid. Answer: Question 3. Rolling friction is utilized by using ball bearings between the hub and the axle of a ceiling fan and the bicycle. (d) glass table Gaurav had to apply more force because there was more friction between the parts of the bicycle. Answer: Therefore, the shape of the body is streamlined to over the frictional force of fluids and to move smoothly through them. The bolting standard will define whether the torque value is for a dry or lubricated stud/bolt thread. The bodies of aeroplanes, missiles and rockets are streamlined to reduce friction with air. Show the direction of frictional force acting on it. Note down the distance. Install the new filter in reverse order. Designed for fast-paced, high-volume laboratories that need to increase analytical cycle times, the Clarus 690 GC provides superior sensitivity, capacity, and throughput – with flexibility to handle more. But in reality, it is good practice to drain the fill, replace the transmission fluid filter, and refill with the proper transmission fluid every 50,000 miles. [Fig. Give examples to show that friction is both a friend and a foe. [NCERT] ... Graphite is used as a lubricant in the form of graphite powder or mixed with petroleum jelly or with any lubricant oil to form graphite grease. Use headphones, even if you don’t listen to music, because your colleagues will know that you mean business when they are on. Answer: Mention the direction of the frictional force acting on it. (c) static, sliding, rolling A ball is set rolling on the ground. Tyres have cut grooves in them Which surface have more friction – rough or smooth ? Solution: When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction. 12.4 (a)]. (a) sliding friction Click to see our best Video content. Put a mark with a pen at any point A on the inclined plane. Question 7. (b) to decrease friction . 5. Lubrication of the moving parts is done to reduce friction between them. We appreciate that you have chosen our cheap essay service, and will provide you with high-quality and low-cost custom essays, research papers, term papers, speeches, book reports, and other academic assignments for sale. Turn off Wi-Fi on your phone. Therefore it is difficult to walk on a soapy floor. (b), Question 10. This article applies to the Mercedes-Benz C-Class (2007-2014). This article applies to the Mercedes-Benz w211/w212 ... Why is My Car Leaking Oil? Answer: Why is friction essential ? Now let a pencil cell move down from this point. In this way, the sportsman can run faster. Answer: Question 2. Question 2. Can you think of an explanation? Make sure that there are no wrinkles in the cloth. Maintain the same slope throughout the activity. Question 8. Why? Question 7. Out of the following, the better lubricant to be used in the moving parts of a machine, Do fluids exert friction ? (e) Sliding friction is _______ than the static friction. Economics (/ ɛ k ə ˈ n ɒ m ɪ k s, iː k ə-/) is the social science that studies how people interact with value; in particular, the production, distribution, and consumption of goods and services.. Economics focuses on the behaviour and interactions of economic agents and how economies work. Would it make it easier or more difficult for you to walk on the floor? Remove the lock clip from the transmission filler tube and remove the cap. What is meant by sliding friction ? Answer: (b) smoothness (or irregularities or nature) Question 12. This article applies to the Mercedes-Benz E-Class w211/w212 (2002-Present). [NCERT] [NCERT] (a) sound energy Newspaper, towel, dry marble floor, wet marble floor. (b) heat energy Wet marble floor, dry marble floor, newspaper and towel. OTC labeling: When used for self-medication, do not use for longer than 7 days; when abdominal pain, nausea, or vomiting is present; or concomitantly with mineral oil (oral products only) Dosing: Adult Suppose your writing desk is tilted a little. Do you feel it easier to move the book in this way than to slide it? (c) playground surfaces of both the objects exert force on each other. Answer: This experiment will take measurements of a sphere and its passage through liquid to calculate viscosity. Four children have got similar toy cars. Does the book stop this time, too? This creates a very high frictional force between the air and spaceship. It helps us to walk comfortably on the floor. Yes, the book stops this time too. Now spread a piece of cloth over the table. Will it stop by itself ? You need to apply some force. The figure, showing the correct direction of frictional-force acting on it, is, Question 2.
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