Question

2.Wheneverthesurfacesincontacttendtomoveormovewithrespecttoeachother,theforce

offrictioncomesintoplay

(a)onlyiftheobjectsaresolid.

(b)onlyifoneoftheobjectsisliquid.

(c)onlyifoneofthetwoobjectsisgaseous.

(d)irrespectiveofwhethertheobjectsaresolid,liquidorgaseous.
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Answer 1

Answer:

can't understand the question