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4-2.Friction
medium
In the figure shown, horizontal force $F_1$ is applied on a block but the block does not slide. Then as the magnitude of vertical force $F_2$ is increased from zero the block begins to slide; the correct statement is
A
The magnitude of normal reaction on block increases
B
Static frictional force acting on the block increases
C
Maximum value of static frictional force decreases
D
All of these
Solution
(c)
$N+F_2=m g$
$N=m g-F_2$
As $F_2$ increases $N$ will decrease
Static friction $f_{ s }=\mu_s N=\mu_s\left(m g-F_2\right)$
$\Rightarrow$ By increasing $F_2, f_s$ will decrease hence the block will slide
Standard 11
Physics
