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

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in Machine Kinematics by (38.0k points)
When the two solid surfaces sliding over each other are free from contaminating fluid or film, the resistance encountered is called

(a) kinetic friction

(b) dry friction

(c) boundary lubrication

(d) none of the mentioned

I got this question in a job interview.

I want to ask this question from Limiting Angle of Friction topic in portion Friction of Machine Kinematics

1 Answer

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by (106k points)
The correct option is (b) dry friction

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

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

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