Question

NCERT VIII - Sciences

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

The book will start sliding down. The friction will act opposite to the direction in which book is sliding. See the figure.

Answer 2

the direction of friction is opposite of direction of motion . the direction of motion is downwards therefore the direction of friction is upwards