State the principle of moments for a lever.

(N/A) The principle of moments for a lever states that for a lever to be in rotational equilibrium,the sum of the clockwise moments about the fulcrum must be equal to the sum of the anticlockwise moments about the same fulcrum.
Mathematically,this is expressed as:
$\text{Load} \times \text{Load Arm} = \text{Effort} \times \text{Effort Arm}$
Where:
$1$. $\text{Load}$ is the weight to be lifted.
$2$. $\text{Load Arm}$ is the perpendicular distance from the fulcrum to the load.
$3$. $\text{Effort}$ is the force applied.
$4$. $\text{Effort Arm}$ is the perpendicular distance from the fulcrum to the effort.