Q. A body presses a book against the front wall such that the book does not move. The force of friction between the wall and the book is
A) Towards right
B) Towards left
C) Downwards
D) Upwards
Explanation
(d) The various forces acting on the book are as shown in the figure
[image:5_image261.emf]
Where, $f =$ Frictional force
$W =$ Weight of a book
$F =$ Applied force
$N =$ Normal reaction
From figure,
The direction of force of friction between the wall and the book is upwards
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.