Physics - NLM Question with Solution | TestHub

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 force acting on the crate.