Which term describes a moment produced by two noncollinear forces?

The term that describes a moment produced by two noncollinear forces is known as the moment of a couple. In mechanics, a couple consists of two equal and opposite forces that do not act along the same line, resulting in a rotational effect rather than a linear one. The noncollinearity of the forces means that they create a turning effect, or moment, around a pivot point.

In this context, a moment of the couple does not depend on the magnitude of the forces but rather on the distance between the lines of action of the two forces, which is often referred to as the arm of the couple. The moment generated by the couple is a key concept in orthodontics and biomechanics, as it plays an essential role in the application of forces to produce desired tooth movements.

The other terms do not accurately describe this particular scenario. The moment of force typically refers to any moment created by a single force acting at a distance from a point. A dual force vector does not have a formal definition in this context and could refer to various situations in vector analysis. Nonlinear force generally refers to forces that do not behave in a linear proportional relationship, but again, this does not apply to the specific situation of moment generation from two noncollinear forces.