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A girl press her physics text book again...

A girl press her physics text book against a rough vertical wall with her hand. The direction of the frictional force on the book exerted by the wall is

A

Downwards

B

upwards

C

Out from the wall

D

into the wall

Text Solution

Verified by Experts

The correct Answer is:
B
frictional force is always parallel to the surface in contact and it opposes the relative motion between the bodies.
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A block of mass M is held against a rough vertical wall by pressing it with a finger . If the coefficient of friction between the block and the wall is mu and the acceleration due to gravity is g , calculate the minimum force required to be applied by the finger to hold the block against the wall.

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Knowledge Check

  • A block of mass M is held against a rough vertical wall by pressing it with a finger . If the coefficient of friction between the block and the wall is mu and the acceleration due to gravity is g , calculate the minimum force required to be applied by the finger to hold the block against the wall.

    A
    `muMg`
    B
    Mg
    C
    `(Mg)/(mu)`
    D
    `2muMg`

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