Which option best describes how to alter the moment of a force?

To understand how to alter the moment of a force, it's essential to recognize that the moment (or torque) created by a force depends on both the magnitude of the force and the distance from the point of application of that force to the pivot point, commonly referred to as the center of resistance in orthodontics.

When the distance from the force vector to the center of resistance is decreased, the moment generated by that force is also reduced. Conversely, increasing this distance amplifies the moment, making it more effective at causing rotation or movement. Therefore, the correct approach to alter the moment of a force is by adjusting this distance, which directly influences how much rotational effect the force will have on that object.

Other options, while they may have effects in different contexts, do not specifically address the mechanics of altering the moment of a force. Increasing the mass of the object does not change the force's moment directly but rather may influence how forces are applied or resisted. Changing the angle of application can affect the effective component of the force that contributes to the moment, but it is the distance from the pivot point that is the most direct way to manipulate the moment at hand.