Question

Suppose your writing desk is tilted a little. A book kept on it starts sliding
down. Show the direction of frictional force acting on it.​

Answer 1

Explanation:

when book flights on the writing desk if frictional force acts between the book and the surface of the desk.the direction of frictional force on the book is opposite the direction of its motion and acts in upward direction as shown in the following figure.

Answer 2

Answer:

When a book slides on the writing desk, a frictional force acts between the book and the surface of the desk . The direction of frictional force on the book is opposite to the direction of its motion and acts in upward direction.

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Explanation:

For better explanation please refer the image....