With a class 2 lever, swapping effort and load transforms it to a class 3. If you discard the arbitrary label of “effort” and “load” and just consider them as forces in equilibrium, then ...

Levers use mechanical advantage to ease lifting; they consist of a bar and a pivot (fulcrum) with effort, fulcrum, and load arranged differently in first, second, and third class levers ...

BrainPOP: Simple Machines: A seesaw is an example of a class 1 lever, a wheelbarrow is an example of a class 2 lever and your arm is an example of a class 3 lever.