Here's why:

* Force: A force is a push or pull that can cause an object to accelerate.

* Net Force: The net force is the overall force acting on an object, considering all the individual forces and their directions.

* Balanced Forces: When forces are balanced, they cancel each other out, resulting in a net force of zero. This means the object will either remain at rest or continue moving at a constant velocity.

* Unbalanced Forces: When forces are unbalanced, there's a net force acting on the object. This net force causes the object to accelerate in the direction of the greater force.

In summary: A net force is what causes an object to accelerate when it's not balanced by opposing forces.