A student sets up an experiment to study the moments of forces using a uniform metre ruler of weight WWW.
Figure 1 shows the apparatus used.
The ruler is supported by a pivot at its exact center.
A brass mass is suspended from the left side of the ruler.
A glass marble is placed in a light holder on the right side of the ruler.
The system is in equilibrium.
State the relationship between the clockwise moment of the force exerted by the glass marble and holder and the anticlockwise moment of the force exerted by the brass mass about the pivot.