Here's why:

* Balanced Forces: When forces are balanced, they cancel each other out. This means the net force is zero, and there is no change in motion. The object either remains at rest or continues moving at a constant speed in a straight line.

* Unbalanced Forces: When forces are unbalanced, the net force is not zero. This means there is a force acting on the object that causes it to accelerate, meaning it changes its speed or direction.

Example:

* Pushing a box: If you push a box with a force of 10 Newtons and someone pushes it in the opposite direction with a force of 5 Newtons, the forces are unbalanced. The net force is 5 Newtons (10 N - 5 N = 5 N), and the box will move in the direction of the stronger force.