2.Wheneverthesurfacesincontacttendtomoveormovewithrespecttoeachother,theforce
offrictioncomesintoplay
(a)onlyiftheobjectsaresolid.
(b)onlyifoneoftheobjectsisliquid.
(c)onlyifoneofthetwoobjectsisgaseous.
(d)irrespectiveofwhethertheobjectsaresolid,liquidorgaseous.
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