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Two blocks A and B of masses 2 kg and 8 ...

Two blocks A and B of masses `2 kg` and `8 kg` respectively are kept in contact and pressed against a roguh vertical wall by applying a horizontal force `F = 50 N` as shown, The frictional force acting between the two blocks is

A

zero

B

`6 N`

C

`8 N`

D

`10 N`

Text Solution

Verified by Experts

The correct Answer is:
B
The two block will move with a common acceleration
`a = (100- 30)/(10) = 7 m//s^(2)`
Now, for the block 'A'
`20 - f_(S) = 2 xx 7`
`therefore f_(S) = 6N`
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Knowledge Check

  • Two blocks A and B of masses 10 kg and 15 kg are placed in contact with each other rest on a rough horizontal surface as shown in the figure. The coefficient of friction between the blocks and surface is 0.2. A horizontal force of 200 N is applied to block A. The acceleration of the system is ("Take g"=10ms^(-2))

    A
    `4"ms"^(-2)`
    B
    `6"ms"^(-2)`
    C
    `8"ms"^(-2)`
    D
    `10"ms"^(-2)`

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