Q

# Can someone help me with this, A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is

• Option 1)

20 N

• Option 2)

50 N

• Option 3)

100 N

• Option 4)

2 N

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As we learnt in

Motion of Block in Contact -

- wherein

$Use\:F_{net}=ma$

$a=\frac{F_{net}}{m_{1}+m_{2} }$

Weight of the block is balanced by force of friction

$\dpi{100} \therefore$   Weight of the block  $\dpi{100} =\mu R=0.2\times 10=2N$

Correct option is 4.

Option 1)

20 N

This is an incorrect option.

Option 2)

50 N

This is an incorrect option.

Option 3)

100 N

This is an incorrect option.

Option 4)

2 N

This is the correct option.

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