Objects which are at rest or moving at constant velocity, may have forces acting on them. However the forces are said to be balanced.

QUESTION: Which special force is zero, when the forces are balanced?

thank you :)

Net force is zero when forces are b alanced.

When the forces acting on an object are balanced, it means that the net force on the object is zero. In other words, all the forces acting on the object cancel each other out and there is no overall force to cause a change in the object's motion.

There is a special force called the "net force" or "resultant force" that represents the combined effect of all the individual forces acting on an object. When the forces are balanced, the net force is equal to zero.

So, to answer your question, the net force is zero when the forces are balanced.