Solve My Mystery: The Winging Seed Problem

  • Context: High School 
  • Thread starter Thread starter nariman
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Discussion Overview

The discussion revolves around the mechanics of a maple seed's descent, specifically focusing on its rotational movement when released. Participants explore the physical principles behind the seed's behavior, including aspects of aerodynamics and angular momentum.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant observes that the maple seed's wing shape resembles a propeller, suggesting that air resistance causes it to rotate rather than fall straight down.
  • Another participant introduces the concept of angular momentum, noting that once the seed begins to rotate, gyroscopic inertia helps maintain its spin, which is centered near the seed part.
  • A later reply mentions the potential influence of terminal velocity on the seed's behavior, although this point remains speculative.
  • One participant references a related question from the IYPT 2008, indicating a broader context for the discussion.

Areas of Agreement / Disagreement

Participants present various perspectives on the mechanics of the maple seed's rotation, with no consensus reached on the exact causes of its angular momentum or the effects of terminal velocity.

Contextual Notes

Some assumptions about the aerodynamics of the seed and the definitions of angular momentum and gyroscopic inertia are not fully explored, leaving certain aspects of the discussion unresolved.

nariman
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Hello To All...
I'm Having A Problem With An Observation...
In This Observation,If I Release A Maple Seed,It Goes Down In A Rotational Movement.
The Question Is Why?
I Hope That Some One Could Help Me...:smile:
Thanx...
 
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Take a look at that Maple seed before you release it! It has one "wing" that looks like one part of a propellor. The seed doesn't fall directly down because air pushes up against that "wing". Because of the slant of the "wing", air also pushes it "to the side" causing it to rotate.
 
Interesting. I don't know what causes it to gain angular momentum, but once it's in the rotating phase, the gyroscopic inertia from its spin opposes anything that will try to stop it from rotating. It rotates around a common centre of mass, and that happens to be close to the "seed" part. Regardless, it just works like a monocopter - the lift generated by the rotation of the wing, and the inertia generated by that rotation just keeps it spinning and spinning.

Maybe that changes if it hits terminal velocity?
 

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