A rectangular block has a square base measuring $a \times a$ and its height is $h$. It moves on a horizontal surface in a direction perpendicular to one of the edges. The coefficient of friction is $\mu$. It will topple if
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$\mathrm{C}:$ center of mass
$\tau_{C}=\mathrm{f} \frac{\mathrm{h}}{2}-\mathrm{N} \frac{\mathrm{a}}{2} \geq 0$ for toppling
$\mu \mathrm{N} \frac{\mathrm{h}}{2}>\mathrm{N} \frac{\mathrm{a}}{2}$ $\mu>\frac{\mathrm{a}}{\mathrm{h}}$
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