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.
Friction can be increased by ______________________ . | |||
Right Option : D | |||
View Explanation |
Which of the following is used as a lubricant to reduce friction? | |||
Right Option : B | |||
View Explanation |
The action of applying oil or grease to an engine or component so as to minimize friction and allow smooth movement is called as ______________________ .
| |||
Right Option : A | |||
View Explanation |
When I have not joined Abhyas Academy, my skills of solving maths problems were not clear. But, after joining it, my skills have been developed and my concepts of science and SST are very well. I also came to know about other subjects such as vedic maths and reasoning.
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 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...
Abhyas is good institution and a innovative institute also. It is a good platform of beginners.Due to Abhyas,he has got knoweledge about reasoning and confidence.My son has improved his vocabulary because of Abhyas.Teacher have very friendly atmosphere also.
I have spent a wonderful time in Abhyas academy. It has made my reasoning more apt, English more stronger and Maths an interesting subject for me. It has given me a habbit of self studying
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...
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
A marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Abhyas is an institute of high repute. Yogansh has taken admission last year. It creates abilities in child to prepare for competitive exams. Students are motivated by living prizes on basis of performance in Abhyas exams. He is satisfied with institute.
We started with lot of hope that Abhyas will help in better understnding of complex topics of highers classes. we are not disappointed with the progress our child has made after attending Abhyas. Though need to mention that we expected a lot more. On a scale of 1-10, we would give may be 7.
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.
My experience with Abhyas academy is very nice or it can be said wonderful. I have been studying here from seven class. I have been completing my journey of three years. I am tinking that I should join Abhyas Academy in tenth class as I am seeing much improvement in Maths and English
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.
My experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
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...
My experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
The experience was nice. I studied here for three years and saw a tremendous change in myself. I started liking subjects like English and SST which earlier I ran from. Extra knowledge gave me confidence to overcome competitive exams. One of the best institutes for secondary education.
My experience with Abhyas Academy has been very good. When I was not in Abhyas whenever teacher ask questions I could not speak it confidently but when I came in Abhyas, my speaking skills developed and now I am the first one to give the answer of teachers question.
Being a parent, I saw my daughter improvement in her studies by seeing a good result in all day to day compititive exam TMO, NSO, IEO etc and as well as studies. I have got a fruitful result from my daughter.
It was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.