Question

A mass rests on a rough horizontal surface having coefficient of friction between the surfaces as $\mu$. A force F at ${30}^{\circ }$ with horizontal pulls the mass. Limiting friction between surface and mass is

• A. $\frac{F}{2}$
• B. $\mu (mg-\frac{F}{2})$
• C. $\mu mg$
• D. $\mu mg-\frac{F}{2}$

Answer 1

The correct option is B $\mu (mg-\frac{F}{2})$



$f_{s1}max={\mu }_{s}N={\mu }_s(mg-Fsin\theta )$

$f_{s1}max=\mu (mg-\frac{F}{2})$