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When the rubbing surfaces are separated from each...

When the rubbing surfaces are separated from each other by a very thin film of lubricant it is known as

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asked Sep 25, 2022 in Machine Kinematics by Leo (38.0k points)

When the rubbing surfaces are separated from each other by a very thin film of lubricant it is known as

(a) kinetic friction

(b) dry friction

(c) boundary lubrication

(d) none of the mentioned

The question was asked in an online quiz.

This intriguing question comes from Limiting Angle of Friction topic in section Friction of Machine Kinematics

machine kinematics
friction
limiting angle of friction

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answered Oct 20, 2022 by Greg (106k points)

The correct answer is (c) boundary lubrication

The explanation is: When the rubbing surfaces are separated from each other by a very thin film of lubricant it is known as boundary lubrication.

When the two solid surfaces sliding over each other are free from contaminating fluid or film, the resistance encountered is called dry friction.

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