Here's why:

* Balanced forces: These are forces that are equal in size and opposite in direction, acting on the same object. They cancel each other out.

* Net force: This is the overall force acting on an object, calculated by adding up all the forces acting on it. Balanced forces result in a net force of zero.

* Newton's First Law: This law states that an object at rest stays at rest, and an object in motion stays in motion at a constant speed and direction, *unless acted upon by a net force*.

In summary: When forces are balanced, there is no net force to cause a change in the object's motion. The object will either remain at rest or continue moving at a constant velocity.