Friction is a necessary evil. Let us now discuss the ways of reducing friction.
Moving parts of machines are therefore, made very smooth. For this, the moving parts are covered with oil or grease. By the use of a suitable lubricant, like oil (for light machinery) or grease (for heavy machinery) friction can be reduced. Lubricants may be in solid, liquid or gaseous forms. When a lubricant is used between two moving surfaces its particles get into the uneven parts of the surfaces and make a thin layer of their own between them. As a result, the motion actually occurs between the layers of lubricating material which are relatively smoother. This is helpful because fluid friction is less than solid friction.
2. If you leave your bicycle unused for a month and then ride it, it needs great effort from you. When you put some machine oil on the chain and sprocket-wheel, the bicycle runs with much less effort. This is because, the friction opposes motion and hence you have to put more effort to move it. The machine oil reduces friction and the bicycle runs more easily.
The surfaces are highly polished, to eliminate the irregularities. This makes the surfaces smooth and reduces friction to a great extent.
Talcum powder is used as a lubricant. When we sprinkle powder on a carrom board, the depressions on the surface of the board and the coins of carrom get filled with the powder. This makes the surface smoother and reduces friction between the board, the striker and the coins of the carrom.
5. Graphite being very soft solid which can be ground to a very fine state. It is then used as a lubricant in those parts of machines, where it is difficult to apply oil. It reduces friction by filling up unevenness between the surfaces.
Friction due to air (air resistance) or water is reduced by using streamlined shapes in aeroplanes or ships. A streamlined shape is narrow in front and broader at the back. All birds have streamlined bodies to ensure minimum friction as they fly through the air. In the same way, ships, boats and fish have streamlined bodies, so that they can move easily in water.
Soap solutions are used in cutting and grinding machines to reduce friction.
Ball bearings are used in machines to reduce friction. These in machines to reduce friction. These are tiny steel balls often placed between moving parts of machines. You might have seen them fitted in the wheels of a bicycle. They reduce friction and save a lot of energy.
Use of wheels between surfaces moving over each other reduces friction. We know that rolling friction is very less than the sliding friction between the two surfaces. Due to this reason, many heavy objects, such as suitcases, travelling bags are provided with small wheels, called as rollers. The rollers reduce friction and help in moving heavy objects easily from one place to another.
1. By making the moving surfaces rough: Tyres of vehicles have designed with grooves on the surface to increase friction. A large friction provides a better grip to vehicles on the road arid prevents them from skidding.
2. By increasing roughness of surfaces: The surface of a matchbox and the head of. the matchstick are deliberately made rough to increase friction.
3. During rains the ground become slippery. So, sand and gravels are spread on grounds to increase friction.
4. You must have seen the spikes in the soles of shoes used by players and athletes. This is done only to increase friction.
Which of the following method is used to avoid friction ? | |||
Right Option : D | |||
View Explanation |
When two surfaces are coated with lubricant, then they can easily__________________ .
| |||
Right Option : B | |||
View Explanation |
Which of the following do not have streamlined body ? | |||
Right Option : D | |||
View Explanation |
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In terms of methodology I want to say that institute provides expert guidence and results oriented monitering supplements by requsite study material along with regular tests which help the students to improve their education skills.The techniques of providing education helps the students to asses...
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About Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Usually we see institutes offering objective based learning which usually causes a lag behind in subjective examinations which is the pattern followed by schools. I think it is really a work of planning to make us students grab the advantages of modes of examination, Objective Subjective and Onli...
It was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
Abhyas institute is one of the best coaching institute in the vicinity of Ambala cantt.The institute provides good and quality education to the students.The teachers are well experienced and are very helpful in solving the problems. The major advantages of the institute is extra classes for weak...
Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
Abhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Abhyas institute is one of the best coaching institute in the vicinity of Ambala Cantt area. The teachers of the institute are well experienced and very helpful in solving the problems of the students.The good thing of the institute is that it is providing extra classes for the students who are w...
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Third consective year,my ward is in Abhyas with nice experience of admin and transport support.Educational standard of the institute recumbent at satisfactory level. One thing would live to bring in notice that last year study books was distributed after half of the session was over,though study ...