A block weighs W is held against a vertical wall by applying a horizontal force F . minimum value of

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4-2.Friction

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A block weighs $W$ is held against a vertical wall by applying a horizontal force $F$. The minimum value of $F$ needed to hold the block is $[\mu < 1]$

A

Less than $W$

B

Equal to $W$

C

Greater than $W$

D

Data is insufficient

(AIIMS-2019)

Solution

The figure show the free body diagram of block.

Here, the force of friction is equal to the weight of block.

$f=W$

$\mu R = W$

$\therefore F =\frac{ W }{\mu}$

As,

$\mu < 1$

$\therefore F > W$

Standard 11

Physics

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