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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Options

A. The force of the book on the crate is less than that of crate on the book.
B. Although there is no friction acting on the crate, there must be friction acting on the book or else it will fall.
C. The net force acting on the book is zero.
D. The direction of the frictional force acting on the book is in the same direction as the frictional force acting on the crate.

Answer

A, B, D

Explanation

Since the book remains at rest…. There is no acceleration of the book which means from Newton's Second law that there is no net force acting on it.