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  4. The direction of the frictional force acting on a book when pressed against a rough vertical wall is:

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Q. The direction of the frictional force acting on a book when pressed against a rough vertical wall is:

NTA AbhyasNTA Abhyas 2020

Solution:

Friction forces are always parallel to the surfaces in contact, which in this case, are the wall and the cover of the book. This tells us that the friction force is either upwards or downwards. Because the tendency of the book is to fall due to gravity, the friction force must be in the upwards direction.