Physics
What type of lever is formed by the human body while
(a) raising a load on the palm, and
(b) raising the weight of body on toes?
Machines
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Answer
(a) When a human body raises a load on the palm then it is an example of a Class III lever. The elbow joint acts as fulcrum F at one end, biceps exerts the effort in the middle and load L on the palm is at the other end.
(b) When raising the weight of body on toes then it is a Class II lever. The fulcrum F is at toes at one end, the load L (i.e. weight of the body) is in the middle and the effort E by muscles is at the other end.
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