Question

How do lubricants reduce friction? (3 marks)

Answer 1

Answer:

Actually lubricants such as oil,grease bring smoothness which reduces friction in machine parts

Explanation:

Answer 2

  Lubricant is a substance which is used to control (more often to reduce) friction and wear of the surfaces in a contact of the bodies in relative motion . Depending on its nature, lubricants are also used to eliminate heat and wear debris, supply additives into the contact, transmit power, protect, seal. A lubricant can be in liquid (oil, water, etc.), solid (graphite, graphene, molybdenum disulfide), gaseous (air) or even semisolid (grease) forms.  

Friction is a type of contact forces that occurs between any two bodies in relative motion.

Friction does not allow any relative motion between two bodies in contact.This happens because no body is perfectly smooth; so whenever two bodies come in contact with each other, it discourages any smooth motion between the uneven zig-zag surfaces.

Lubrication helps fill in the uneven zig zag surface, tries to make it smoother in order to allow smooth relative motion between the surfaces, thereby reducing friction.      

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