Disadvantage of Friction
Disadvantages of Friction
Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
Friction is a necessary evil: A matchstick lights up due to friction against the side of matchbox when we strike it. This can destroy houses when catches fire. A tyre of wheel has rough surface to have more of a friction. If there is no friction the vehicle will skid. Friction is necessary for carrying out day to day activities because without this force we cannot set the bodies in motion or stop the moving bodies. On the other hand, friction wastes energy, brings about wear and tear and slows down motion. Thus, we can say that friction is a necessary evil as without it, we cannot do our day -to-day activities and with it we lose energy, speed.
Which of the following are correct ? (a) Friction reduces heat, the engines of cars and other machinery, therefore, become very hot after running for some time. (b) Energy is wasted in overcoming the force of friction. (c) It is due to the friction between branches of trees which rub against each other, that forest fires occur.
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| Right Option : B | |||
| View Explanation | |||
Disadvantage of friction _______________ . | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct ? (a) In factories where machinery is in use only for single time, friction can be a nuisance. (b) Friction produces heat, the engines of cars and other machinery, therefore, become very hot after running for some time. (c) Energy is wasted in overcoming the force of friction . | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [10]
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.
Shreya Shrivastava
8thMy 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.
Shivam Rana
7thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thBeing 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.
Prisha Gupta
8thIt 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.
Cheshta
10thAbhyas 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.
Om Umang
10thAbhyas 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.
Manish Kumar
10thA 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.
Archit Segal
7thIt 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.
Eshan Arora
8thMy 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.
