If you take ccw as positive, then the moment vector points out of the page toward you, using the right hand rule, in the positive Z direction. It follows that cw moments are then negative, pointing in the negative Z direction into the page away from you. So the first 2 moments, being cw are negative, and the last, being ccw, is positive, per your chosen convention.engineer_dave said:
The direction of moment forces is the direction in which the force is applied in relation to the axis of rotation.
The direction of moment forces is determined by the right-hand rule, which states that if the fingers of the right hand curl in the direction of the force, the thumb will point in the direction of the moment.
No, moment forces can be applied at any angle in relation to the axis of rotation. However, the perpendicular distance from the axis of rotation to the line of action of the force is what determines the magnitude of the moment.
Changing the direction of moment forces can change the direction and magnitude of the resulting torque, which is the rotational equivalent of force.
The direction of moment forces can affect the stability of an object by either increasing or decreasing the object's tendency to rotate. For example, a force applied in the same direction as the object's rotation can increase its rotational speed, while a force applied in the opposite direction can slow or stop its rotation.
