For example, head extension is a good example of a first-class lever system. Here, neck and back muscles apply an force to move the head. The weight of the head it the load, and the fulcrum is the joint between the skull and the vertebrae.n a second-class lever, the load is located between the force and the fulcrum. A wheel barrow is great example of a second-class lever system. Here, the wheel is the fulcrum, or the pivot point, the weight is the load and lifting the handles applies the force to move the load.
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