Physics
Give an example of each class of lever in a human body.
Machines
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Answer
The examples of each class of lever in a human body are:
(i) The action of nodding of the head is a Class I lever. In this case the spine acts as the fulcrum F, load L is at its front part while effort E is at its rear part.
(ii) The action of raising the weight of the body on toes is an example of Class II lever. In this case, the fulcrum F is at toes at one end, the load L (i.e. the weight of the body) is in the middle and effort E by muscles is at the other end.
(iii) The action of raising a load by forearm is an example of Class III lever. In this case the elbow joint acts as fulcrum F at one end, biceps exerts the effort E in the middle and a load L on the palm is at the other end.
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