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When a book slides on the writing desk, a frictional force acts between the book and the surface of the desk. The direction of frictional force on the book is opposite to the direction of its motion and acts in upward direction, as shown in the figure.
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@ujjwalusri
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Just as all things wear away under friction, even rock cliffs are worn away by winds and currents, your shoe's soles are rubbed and scraped agains the ground repeatedly, or the bottom of your foot if we're talking about the inside of a shoe.
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When a book slides on the writing desk, a frictional force acts between the book and the surface of the desk. The direction of frictional force on the book is opposite to the direction of its motion and acts in upward direction, as shown in the figure.
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