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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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