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A body of mass m is kept on a rough horizontal surface (coefficient of friction = $\mu$). A horizontal force is applied on the body, but it does not move. The resultant of normal reaction and the frictional force acting on the object is given by F, where F is:
Detailed Solution
$N=mg$ and static friction $f\le\mu mg$. The resultant contact force is $\sqrt{N^2+f^2}\le\sqrt{(mg)^2+(\mu mg)^2}=mg\sqrt{1+\mu^2}$.