At what conditions does the Coulomb friction occur between the surfaces in contact of collar bearings or pivots?

When there is no friction fluid

When there is no lubricating fluid

When there is no adhesive fluid

When there is no cohesive fluid

At what conditions does the Coulomb friction occur between the surface

1.	At what conditions does the Coulomb friction occur between the surfaces in contact of collar bearings or pivots?
A.	When there is no lubricating fluid
B.	When there is no friction fluid
C.	When there is no adhesive fluid
D.	When there is no cohesive fluid
Answer» B. When there is no friction fluid

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At what conditions does the Coulomb friction occur between the surfaces in contact of collar bearings or pivots?

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