Chapter - 2 Friction

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Q
Friction

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:

When the book slides down on the desk, a frictional force acts between the book and the surface of the desk. The direction of the friction force on the book is opposite to the direction of its motion as shown in the diagram below.


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