Here's why:

* Newton's First Law of Motion states that an object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity, unless acted upon by a net force.

* Balanced forces are forces that are equal in magnitude and opposite in direction. When forces are balanced, they cancel each other out, resulting in no net force.

* Unbalanced forces are forces that are not equal in magnitude or direction. They result in a net force, causing an object to accelerate or change its motion.

Therefore, when an object is stationary, it means that the forces acting on it are balanced. This can include forces like gravity, friction, and normal force, all canceling each other out.