A 5 m long bar is pivoted on their left end with a downward force of 10 N applied on the right end. What is the moment of force?

To find the moment of force (also known as torque), you calculate it by multiplying the force applied by the distance from the pivot point to the point where the force is applied, taking into account the direction of the force. In this scenario, a downward force of 10 N is applied at the right end of a 5 m long bar that is pivoted at the left end.

The calculation for the moment of force is as follows:

Moment of force = Force × Distance from the pivot = 10 N × 5 m = 50 Nm.

Since the force is acting downward at the end of the bar, its effect creates a clockwise rotation about the pivot point. Therefore, the moment of force is 50 Nm in the clockwise direction.

This explanation clarifies that the correct answer represents the magnitude of the moment of force produced by the applied force at the specified distance from the pivot, emphasizing the importance of the direction in which the force is applied.