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.
Answers
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).Superlubricity, 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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