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Q.
A block has weight $W$ and it is wall held against a vertical wall by applying a horizontal force $F$. The minimum value of $F$ is
Laws of Motion
Solution:
The mass is held up by the force of static friction.
$f=W$ and $f \leq \mu N$ or $f \leq \mu F$
$\Rightarrow W \leq \mu F$ or $F_{\min }=\frac{W}{\mu}$
$\geq \mu$ is always less than $1, \frac{W}{\mu}>W$ or $F_{\min }>W$
