GENERAL KNOWLEDGE

Detailed explanation-1: -When lubricant is applied between the moving parts of a machine, a thin layer is formed there and moving surfaces do not directly rub against each other. Interlocking of irregularities is avoided to a great extent and movement becomes smooth. Thus friction is reduced.

Detailed explanation-2: -Using lubricants such as oil or grease can reduce the friction between the surfaces. By polishing the surface, polishing makes the surface smooth and friction can be reduced.

Detailed explanation-3: -When friction is undesirable we have to reduce the friction. Friction can be minimized by using lubricants like oil and grease and by using ball bearing between machine parts. A substance that is introduced between two surfaces in contact, to reduce friction, is called a lubricant.

Detailed explanation-4: -Lubricants are substances typically used to reduce friction between parts in contact. Depending on the type, lubricants also perform various other functions such as heat regulation, power transmission, sealing against dust or dirt, as well as reducing oxidation and preventing corrosion.

Detailed explanation-5: -lubricating the surfaces. use of ball bearings (i.e. replacing sliding friction with rolling friction) streamlining the body.