Here's why:

* Forces are pushes or pulls. They can cause objects to start moving, stop moving, or change direction.

* Balanced forces are equal in size and opposite in direction. They cancel each other out.

* Net force is the overall force acting on an object. When forces are balanced, the net force is zero.

* 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.

Examples:

* A book sitting on a table: The force of gravity pulling the book down is balanced by the normal force from the table pushing the book up. The book remains at rest.

* A car traveling at a constant speed: The force of the engine pushing the car forward is balanced by the force of friction from the road and air resistance. The car continues moving at a constant speed.

In conclusion, when forces are balanced, there is no net force, and the object will either stay at rest or continue moving at a constant velocity.