Ants Go Marching: How Long Before Oblivious End?

  • Context: Undergrad 
  • Thread starter Thread starter BobG
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Discussion Overview

The discussion revolves around a thought experiment involving 100 ants placed randomly on a one-meter-long stick, exploring the dynamics of their movement and interactions as they collide and fall off the stick. The focus is on determining the longest possible time before all ants fall off, with implications for understanding motion and collision in a simplified model.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that the problem can be simplified by treating the ants as indistinguishable point particles, implying that their collisions can be modeled as if they pass through each other without changing direction.
  • Another participant agrees with the simplification, stating that this leads to the conclusion that no ant can travel more than one meter without falling off the stick, resulting in a maximum time of one minute.
  • A later reply emphasizes the simplicity of the problem, suggesting that the challenge lies in recognizing this simplification.
  • One participant expresses frustration about the catchy song associated with the problem, indicating a light-hearted tone amidst the technical discussion.

Areas of Agreement / Disagreement

Participants generally agree on the simplification of the problem and the resulting conclusion about the time it takes for the ants to fall off the stick. However, the discussion does not delve into alternative interpretations or models, leaving some aspects of the problem open to further exploration.

Contextual Notes

The discussion assumes that the ants are indistinguishable and does not address potential complexities arising from their interactions beyond the stated simplification. The implications of this model on real-world scenarios are not explored.

Who May Find This Useful

Readers interested in mathematical modeling, dynamics of motion, or conceptual puzzles may find this discussion engaging.

BobG
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The ants go marching...

100 ants are placed along a one-meter-long stick in random places. The stick is exactly one ant wide. Each ant moves at one meter per minute. When two ants collide, they each reverse direction. When an ant comes to the end of the stick, it falls off into oblivion. What is the longest possible amount of time before all the ants meet their doom?

Hint: One ant looks very much like another ant.
 
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Hurrah! Hurrah!
 
Seriously, it's very easy. Here it is:

The elastic collision of two indistinguishable point-particle ants is the same as the two ants passing through one another without interacting. In the latter model, no ants change direction, so no ant could travel more than one meter without reaching the end of the meterstick. Hence, one minute.[/color]
 
Wow, this got a rousing response. :rolleyes:

Yes, the only challenge is in realizing just how simple the problem actually is.
 
Thanks, now I have that stupid children's song stuck in my head again!
 

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