Levers use moments to move things, they have a pivot and you apply a force to one end to move the object, it is easier to move the objects the further you are from the pivot beacuse it increases the moment with less force needed.
The object on the other end of the lever also exerts a force on the lever, when you move the object you are actually just creating a larger moment on your side of the lever, it goes out of equilibrium and turns.
This allows you to lift things that you normally couldn't, eg. an object exerts 100N of force 1m from the pivot, meaning it has a moment of 100Nm, if you exert 25N on the lever but you are 5m from the pivot, you create a moment of 125Nm, as your moment is larger the lever starts to rotate in the direction you apply force to.
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