The correct answer to this fill-in-the-blank question is "net".

The combination of all the forces acting on an object is known as the net force.

Would you like more details on this concept? Here are some related questions to deepen your understanding:

1. What happens to an object when the net force acting on it is zero?
2. How is net force calculated when multiple forces are acting in different directions?
3. How does net force affect the acceleration of an object?
4. What is the difference between net force and individual forces?
5. Can an object be in motion if the net force on it is zero?

Tip: Remember, if forces are balanced (net force is zero), the object remains in its current state of motion or rest, according to Newton's First Law.