If acceleration of A is 2 ,m / s ^2 which is smaller than acceleration of B then value of frictional

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4-2.Friction

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If acceleration of $A$ is $2 \,m / s ^2$ which is smaller than acceleration of $B$ then the value of frictional force applied by $B$ on $A$ is ......... $N$

A

$50$

B

$20$

C

$10$

D

None of these

Solution

(c)

Ref. image $I$

Given that acceleration of block B is $2 m / sec ^2$

Drawing $FBD$ of $A$ ref. image $II$

$f _2$ frictional force due to $B$

Now $=\frac{ f }{ m }= a$

$\Rightarrow \frac{ f }{5}=2$

$\Rightarrow f _2=10\,N$

$10\,N$ of frictional force is applied by $B$ on $A$

Standard 11

Physics

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