A wheelbarrow demonstrates this type of lever system. Second-class levers are uncommon in the body, but the best example is the act of standing on your toes. All second-class levers in the body work at a mechanical advantage because the muscle insertion is always farther from the fulcrum than the load. read more
All three types are found in the body, but most levers in the human body are third class. A first-class lever has the axis (fulcrum) located between the weight (resistance) and the force (figure 1.21 a). An example of a first-class lever is a pair of pliers or scissors. First-class levers in the human body are rare. read more