The force of friction between two surfac...

The force of friction between two surfaces will increase if
(A) a layer of lubricant is kept between the two surfaces. (B) the two surfaces are pressed harder. (C) air gap is created between the two surfaces. (D)irregularities on both the surfaces are removed.

A

(a)C

B

(b)A

C

(c)D

D

(d)B

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