Final answer:
The moment of the given force about point O can be determined by multiplying the force magnitude by the perpendicular distance from the point to the line of action of the force.
Step-by-step explanation:
The moment of force (torque) about a point is determined by multiplying the magnitude of the force by the perpendicular distance from the point to the line of action of the force. In this case, the force F is 50 N and the moment arm is the distance between point O and the line of action of the force.
To determine the moment, multiply the force by the moment arm: Moment = F * r
Therefore, the moment of the force F about point O is equal to 50 N multiplied by the distance from O to the line of action of the force.