Final answer:
First-class levers, such as see-saws, wheelbarrows, and rakes, have the fulcrum positioned between the effort and the load.
Step-by-step explanation:
First-class levers are a type of simple machines where the fulcrum is positioned between the effort and the load. In these levers, examples include see-saws, wheelbarrows, and rakes. In a see-saw, the fulcrum is the point where the plank is balanced and the effort and load are on opposite ends. A wheelbarrow is a first-class lever where the wheel acts as the fulcrum, the handles provide the effort, and the load is carried in the container. Similarly, a rake can also function as a first-class lever with the fulcrum at the point where the handle meets the ground, the effort applied by the person pushing the rake, and the load being the leaves or debris being collected.
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