1.

If \[{{\mu }_{s}},\,{{\mu }_{k}}\] and \[{{\mu }_{r}}\] are coefficients of static friction, sliding friction and rolling friction, then                  [EAMCET (Engg.) 1995]

A.                         \[{{\mu }_{s}}<{{\mu }_{k}}<{{\mu }_{r}}\]                 
B.                         \[{{\mu }_{k}}<{{\mu }_{r}}<{{\mu }_{s}}\]            
C.             \[{{\mu }_{r}}<{{\mu }_{k}}<{{\mu }_{s}}\]
D.               \[{{\mu }_{r}}={{\mu }_{k}}={{\mu }_{s}}\]
Answer» D.               \[{{\mu }_{r}}={{\mu }_{k}}={{\mu }_{s}}\]


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