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.
Answer :
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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