A class 2 lever is a lever with the fulcrum or joint at one end, with the load that is being carried in the middle. The effort, which is the object lifting or pulling the lever, is at the opposite end from the fulcrum.
An example of a class 2 lever is a wheelbarrow. In a wheelbarrow, the front wheel serves as the fulcrum, the load is placed in the bucket in the middle, and the handles serve as the effort. In a class 2 lever, the mechanical advantage is always greater than one, meaning you can lift objects that are heavier than the amount of force you put into the lever.