Question

collect information either from internet or from books in library, about various new techniques being adopted by human beings to reduce energy losses due to friction. prepare a note on that

Answer 1

The technology of lubrication is called tribology. This has made many advances in recent years. Whereas in the past bearings had to be topped up with a grease gun for example or even had constant loss lubrication systems, now nearly all machine bearings are sealed permanently or rely on frictionless components. Vehicles are also more efficient and their synthetic oil sumps need less oil changes. The development of really strong ceramic magnets has also lead to the development of 'floating' non contact bearings kept apart by magnetic repulsion. The energy losses are not much less than in the past, and never amounted to several percent , but the time saved in maintenance and repair is considerable.
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Answer 2

Hope it helps...!!!

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Various new techniques being adopted by human beings to reduce energy losses due to friction are :

1) Devices:

=> Such as wheels, ball bearings, roller bearings, and air cushion or other types of fluid bearings can change sliding friction into a much smaller type of rolling friction.


2) Many thermoplastic materials such as nylon, HDPE and PTFE are commonly used in low friction bearings.


3) Lubricants:

=> A common way to reduce friction is by using a lubricant, such as oil, water, or grease, which is placed between the two surfaces, often dramatically lessening the coefficient of friction.

4)Super Lubricity, a recently discovered effect, has been observed in graphite: it is the substantial decrease of friction between two sliding objects, approaching zero levels. A very small amount of frictional energy would still be dissipated.Lubricants to overcome friction need not always be thin, turbulent fluids or powdery solids such as graphite and talc; acoustic lubrication actually uses sound as a lubricant.


5) Another way to reduce friction between two parts is to superimpose micro-scale vibration to one of the parts. This can be sinusoidal vibration as used in ultrasound-assisted cutting or vibration noise, known as dither.

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