What term refers to the sum of all of the forces acting on an object?

That is called the resultant

The sum of all the forces acting on the object is zero .which is the first condition of it and it has two forms

so whats the answer

The term that refers to the sum of all forces acting on an object is called the "net force." To calculate the net force, you need to consider all the forces acting on the object and determine their collective effect. The net force can be determined by adding together all the vector quantities of the individual forces, taking into account their magnitudes and directions.