Angular momentum of a half filled waterbottle....

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Discussion Overview

The discussion revolves around the angular momentum of a half-filled water bottle, specifically whether it will increase, decrease, or remain the same when the bottle is spun. The conversation explores the conditions and definitions necessary to address the question, including the axis of rotation.

Discussion Character

  • Exploratory, Debate/contested, Conceptual clarification

Main Points Raised

  • One participant questions whether the angular momentum will increase, decrease, or remain the same.
  • Another participant asks for clarification on what the angular momentum is being compared to.
  • A subsequent reply specifies that the comparison is to the angular momentum of the bottle at the instant it started spinning.
  • There is a request for clarification on the axis around which the bottle is spinning.
  • Another participant emphasizes the need for a clear definition of the axis, noting that the center is not an axis and that multiple lines can pass through a point, suggesting that more details are needed to answer the question accurately.

Areas of Agreement / Disagreement

Participants do not reach a consensus, as there are multiple competing views regarding the necessary details to answer the initial question about angular momentum.

Contextual Notes

Participants highlight the importance of specifying the axis of rotation and the conditions under which the angular momentum is being evaluated, indicating that assumptions and definitions are crucial to the discussion.

Prashan Shan
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Will the angular momentum of a half filled waterbottle increase? or decrease? or remain the same?
 
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As compared to what?
 
nasu said:
As compared to what?
when compared to the angular momentum of the bottle at instant when it started spinning.
 
Spinning around what axis?
 
nasu said:
Spinning around what axis?
about its center.
 
The center is not an axis. The axis is a line. It may go through the center. But there are many lines going through a point.
Look, you need all the details of a question before you can even think about an answer. You cannot expect people to read your mind and figure out by themselves what you want to ask.
 

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