When two forces working in opposite directions are not the same strength, it's called an unbalanced force. This results in a net force, which is the overall force acting on an object.

Here's a breakdown:

* Balanced forces: When two forces are equal in strength and opposite in direction, they cancel each other out. The object remains at rest or continues moving at a constant speed.

* Unbalanced forces: When two forces are unequal in strength and opposite in direction, they don't cancel each other out. The stronger force wins, causing the object to accelerate in the direction of the stronger force.

Example:

Imagine pushing a box with a force of 10 Newtons to the right, while someone else is pushing it with a force of 5 Newtons to the left.

* The forces are unbalanced because they are not equal.

* The net force is 5 Newtons to the right (10 Newtons - 5 Newtons = 5 Newtons).

* The box will move to the right, accelerating in the direction of the stronger force.