Physics
Match the movement of the body part in Column A to the class of lever in Column B.
| Movement of the body part (Column A) | Class of lever (Column B) |
|---|---|
| (a) Nodding head | • Class III |
| (b) Lifting body weight on your toes | • Class II |
| • Class I |
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Answer
| Movement of the body part (Column A) | Class of lever (Column B) |
|---|---|
| (a) Nodding head | • Class I |
| (b) Lifting body weight on your toes | • Class II |
Reason —
(a) In class I lever, the fulcrum is in between the effort and the load so in the same manner in nodding head, the spine acts as the fulcrum, load is at its front part while effort is at its rear part as shown in below figure.
(b) In class II lever, the fulcrum and the effort are at the two ends of the lever and the load is somewhere in between the effort and the fulcrum so like class II, the weight of the body is raised on toes where the fulcrum is at the toes at one end, the load (i.e., weight of the body) is in the middle and effort by muscles is at the other end as shown in below figure.
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