Question

Minimum force required to keep a block of mass $1\, kg$ at rest against a rough vertical wall is $P$. If a force $P / 2$ is applied then find the acceleration of the block (in $m / s ^{2}$ ). (Take $g=10\, m / s ^{2}$ )

Answer 1

$N=P$
$f_{\max }=0.5 P=10\, N$
$P=20\, N$

If applied force is $\frac{P}{2}$, i.e. $10\, N$,
$10-(0.5)(10)=10 \times a$
$a=5\, m / s ^{2}$