To maintain the meter rule in the experiment of moment, you need to ensure two conditions:
1. Balance: The meter rule should be balanced horizontally. This means that it should be placed on a pivot or fulcrum in such a way that it can rotate freely. The rule should be supported at a specific point called the pivot or fulcrum, which allows it to rotate easily. It is important to position the pivot at a specific point, usually the center, to maintain balance.
2. Equal Forces: The forces applied on each side of the pivot should be equal. In the experiment of moment, you usually apply weights or masses to one side of the rule. To maintain equilibrium, the sum of the clockwise moments (caused by the weight) should be equal to the sum of the anticlockwise moments (caused by the forces on the other side of the pivot). This ensures that the rule remains in a balanced state.
By satisfying these two conditions, you can maintain the meter rule in the experiment of moment and accurately study the relationship between the weight applied and the distance from the pivot.