A lever is a tool that transmits force using a rod. With a lever, you can work with relatively little force.
The minimum force required to move the lever can be adjusted by the length of the lever.
Work at the lever
According to the principle of work, the amount of work I have done to the lever and the amount of work that the lever has done to an object are equal.
Load (N) × The distance from the fulcrum to the load (m) = The minimum force to move the lever (N) × The distance from the fulcrum to the effort (m)
In a laboratory environment, it is recommended to move the lever slowly. This prevent that unnecessary force is applied to the lever.