Understanding Work Done: A Bicycle Puncture Example

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Discussion Overview

The discussion revolves around the concept of work done in the context of a bicycle puncture, specifically examining how the escaping air from the puncture relates to work being performed. Participants explore the mechanics of air movement and the implications of air pressure changes during this process.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants question how the escaping air constitutes work done, seeking clarification on what is doing work and what is being acted upon.
  • One participant suggests that the escaping air does work on the surrounding air, while the remaining air in the tire also does work on the air it pushes out, indicating two instances of work being done.
  • Another participant challenges the notion of "still air" pushing the escaping air, arguing that the air remaining in the tire is expanding and thus not still.
  • There is a discussion about temperature changes, with one participant suggesting that temperature increases due to expansion, while another counters that temperature decreases as the air expands.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the mechanics of work done in this scenario, with multiple competing views on the nature of air movement and temperature changes. The discussion remains unresolved, as no consensus is reached on these points.

Contextual Notes

Participants do not fully agree on the definitions of work done in this context, and there are unresolved questions about the assumptions regarding air behavior and temperature changes during the puncture event.

Faiq
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How is in a bicycle puncture, the air flowing out of the puncture constitutes as an example for work done?
 
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Faiq said:
How is in a bicycle puncture, the air flowing out of the puncture constitutes as an example for work done?
Work done on what by what?
 
I also don't know that. The question was stated as "In which example is work done?" and this option is the correct answer
 
Faiq said:
I also don't know that. The question was stated as "In which example is work done?" and this option is the correct answer
Well the escaping air does work on the surrounding air in pushing it back. And the air still remaining in the tire does work on the air that it is pushing out ahead of it. So there are two places where work is being done.
 
How is the still air pushing the escaping air out?
 
Faiq said:
How is the still air pushing the escaping air out?
The air remaining in the tire is expanding as it pushes the air ahead of it out. So it is not still air.
 
Temperature has increased in this example (since the air is expanding)?
 
Faiq said:
Temperature has increased in this example (since the air is expanding)?
Temperature decreases in this example since the air is expanding.
 
Oh yeah sorry got it
 

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