Levers

Levers are categorised into three classes based on the arrangement of the fulcrum (pivot point), effort (input force) and load (output force).

A first class lever has the fulcrum in the middle (e.g. a seesaw).

A second class lever has the load in the middle (e.g. a wheelbarrow).

A third class level has the effort in the middle (e.g. tweezers).