Why doesnt a book placed on a table move?

A book placed on a table doesn't move because it is in a state of static equilibrium, where the forces acting on it are balanced. The force of gravity pulling the book downward is countered by the normal force exerted by the table pushing upward. Without any external force applied to it, such as a push or pull, the book remains at rest due to Newton's first law of motion, which states that an object at rest will stay at rest unless acted upon by an unbalanced force.