If an object is static (not moving), it means the object is in equilibrium. This means the forces acting on the object must be balanced. Here's what that means:

* Net force is zero: The sum of all forces acting on the object must equal zero.

* Equal and opposite forces: For every force acting on the object, there must be an equal and opposite force. This ensures that the forces cancel each other out.

Example:

Imagine a book sitting on a table.

* Gravity pulls the book down.

* The table's normal force pushes the book up.

These two forces are equal in magnitude and opposite in direction, resulting in a net force of zero. Therefore, the book remains static.