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4-2.Friction
easy
જો ${\mu _s},\,{\mu _k}$ અને ${\mu _r}$ સ્થિત ઘર્ષણાંક ગતિક ઘર્ષણાંક અને રોલિંગ ઘર્ષણાંક હોય તો
A
${\mu _s} < {\mu _k} < {\mu _r}$
B
${\mu _k} < {\mu _r} < {\mu _s}$
C
${\mu _r} < {\mu _k} < {\mu _s}$
D
${\mu _r} = {\mu _k} = {\mu _s}$
Solution
(c) $\mu_{r}<\mu_{k}<\mu_{s}$
which implies that the rolling friction is least because of the wheel and rotating effect and the kinetic friction is in middle of the series because of its moving properties $\&$ static friction is highest because of the limiting moving properties.
Standard 11
Physics
