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Suppose your writing desk is tilted to a position where a book kept on it just starts sliding down. The figure, showing the correct direction of frictional force acting on it, is ..........
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Academic Physics NCERT Class 8

Friction always acts in direction opposite to relative motion.

Here since the book is sliding down, the friction should act upwards along the inclined desk.

So answer is (d)

Updated on: 10-Oct-2022

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