Q. 44.3( 169 Votes )
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.
The frictional force is opposing force generated by two surfaces that contacts and slide against each other. The frictional force will act in a direction opposite to the direction of the motion the book i.e. downwards. Hence, frictional force will exert in upward direction when book is sliding downward.
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