The completion of the statements based on the concept of net force, abbreviated as $F_{\text{net}}$ or $\sum F$, which represents the vector sum of forces acting on an object, would be:

• To determine the $\sum F$ acting on an object in one dimension, we subtract forces acting in opposite directions and add forces acting in the same direction.

This approach takes into account the vector nature of forces, where forces aligned in the same direction enhance each other, and those in opposite directions counteract each other.

Would you like to learn more about this topic or any other questions? Here are some related questions to explore:

1. What is the formula for calculating net force when forces are applied at angles?
2. How can you resolve forces into components?
3. What are the effects of net force on the motion of an object according to Newton's second law?
4. What is the significance of the direction of a force vector?
5. How do you calculate the resultant force when more than two forces are involved?

Tip: Always draw a free-body diagram to visually represent all forces acting upon an object. This helps in accurately applying the principles of vector addition.