Here's why:

* Newton's First Law of Motion (Law of Inertia): This law 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 an unbalanced force.

* Balanced Forces: When forces are balanced, they cancel each other out. This means there's no net force acting on the object.

* No Net Force, No Acceleration: Since there's no net force, there's no acceleration. Acceleration is a change in velocity. If an object is at rest and not accelerating, it will remain at rest.

In summary: If the forces acting on an object are balanced, the object will either remain at rest (if it was initially at rest) or continue moving at a constant velocity (if it was initially in motion).