Question

If the friction is sufficient to prevent the block from sliding, then the minimum value of $F$ for which the cube begins to topple about an edge is

• A. $\frac{2}{3}mg$
• B. $\frac{3}{4}mg$
• C. $\frac{1}{2}mg$
• D. $mg$

Answer 1

Answer: (B)

Balancing torque about point $O$
$mg\left(\frac{a}{2}\right)=F\left(\frac{2 a}{3}\right)$
$F=\frac{3}{4}mg$