A body of mass m rests on horizontal surface. The coefficient of friction between the body and the surface is $\mu .$ If the mass is pulled by a force $P$ as shown in the figure, the limiting friction between body and surface will be
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(c) Normal reaction $R = mg - P\sin {30^o}$ $ = mg - \frac{P}{2}$
Limiting friction between body and surface is given by,
$F = \mu R = \mu \left( {mg - \frac{P}{2}} \right)$.
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