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A book leans against a crate on a table. Neither is moving. Which of the following statements concerning this situation is/are incorrect ?

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The force of the book on the crate is less than that of crate on the book

Although there is no friction acting on the crate, there must be friction acting on the book or else it will fall

The net force acting on the book is zero

The direction of the frictional force acting on the book is in the same direction as the frictional acting on the crate.

answer is A, B, D.

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Detailed Solution

Option (1) is incorrect according to Newton's third law of motion .

Option (2) is incorrect as frictional force must act on the crate to keep it in equilibrium .

Option (4) is incorrect as frictional forces acting on the book and self are oppositely directed .

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