Physics
Match the columns by choosing the body part and corresponding mechanical lever of the same class.
| Human body part | Mechanical lever |
|---|---|
| i. Nodding head | (a) Bottle Opener |
| ii. Lifting body weight on your toes. | (b) Tongs |
| (c) See-Saw |
Answer
(i) - (c)
(ii) - (a)
Explanation:
(i) (c) : class I lever
- Nodding head : In this action, the spine acts as the fulcrum F, load L is at its front part, while effort E is at its rear part. Since the fulcrum is between load and effort, Thus, this is an example of class I lever.
- See-Saw : Since the fulcrum is between load and effort, the see-saw satisfies the condition for a class I lever.
(ii) (a) : class II lever
- Lifting body weight on your toes: the weight of the body is raised on toes. The fulcrum F is at the toes at one end, the load L (i.e., weight of the body) is in the middle and effort E by muscles is at the other end. Thus, this is an example of class II lever.
- Bottle Opener: Now let’s map this to a bottle opener in action:
| Component | In the Bottle Opener |
|---|---|
| Fulcrum | The lip or rim of the bottle cap |
| Load | The bottle cap resisting removal |
| Effort | The force your hand applies at the handle |
The load is positioned between the fulcrum and the effort. Thus, this is an example of class II lever.
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