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Pivot diagram of a Class 2 lever
Different classes of levers are identified by the way the joint and muscles attached to the bone are arranged.
For the Class 2 lever the load is between the pivot and the effort (like a wheelbarrow). The effort force needed is less than the load force, so there is a mechanical advantage.
Standing on tip toes is a Class 2 lever. The pivot is at your toe joints and your foot acts as a lever arm. Your calf muscles and achilles tendon provide the effort when the calf muscle contracts. The load is your body weight and is lifted by the effort (muscle contraction).
Rights: The University of Waikato Te Whare Wānanga o Waikato
Published: 21 June 2007Size: 17 KB
