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

 

Answers (1)

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

\therefore   Weight of the block  =\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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