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Question
Give an example of each class of lever in a human body.
Solution
- Class I lever in the action of nodding of the head: In this action, the spine acts as the fulcrum, load is at its front part, while effort is at its rear part.
- Class II lever in raising the weight of the body on toes: The fulcrum is at the toes at one end, the load is in the middle and effort by muscles is at the other end.
- Class III lever in raising a load by forearm: the elbow joint acts as a fulcrum at one end, the biceps exert the effort in the middle and a load on the palm is at the other end.
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