Is Throwing a Knife with No Spin Actually More Effective?

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Homework Help Overview

The discussion revolves around the effectiveness of throwing a knife with or without spin, exploring the physics behind knife dynamics and air resistance. Participants are questioning the assumptions regarding rotational motion and its impact on velocity and drag.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Some participants discuss the relationship between knife rotation and air drag, noting that a rotating knife may experience different drag based on its orientation. Others question the validity of claims regarding the effectiveness of spinning versus straight throws and seek scientific references to support these claims.

Discussion Status

The discussion is ongoing, with participants exploring various interpretations of the effectiveness of knife throwing techniques. Some have provided links to external sources, but there is a call for more scientifically valid references to substantiate the claims made.

Contextual Notes

Participants are navigating the challenge of finding credible scientific sources to support their arguments, indicating a potential gap in available information on the topic.

Aurelius120
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Homework Statement
I have heard that if you spin a knife it hits harder than if allowed to fly tangentially
Relevant Equations
NA
They say that a rotating knife thrown is more dangerous than a knife thrown straight

I find it weird

  • If the knife is rotating, it will experience more air drag than if thrown straight which will also depend on plane of rotation(For some reason, I don't know, it experiences more drag if rotated in horizontal plane than if in the vertical plane)
  • One end of it will have greater velocity than it could have in pure translation but hey! There is no saying which end will hit the target and that end will probably have maximum velocity(as in rolling motion)
So does that actually mean any advantage
 
Physics news on Phys.org
It is easier to get a high velocity with a throw that spins the knife from the point instead of one that throws it like a dart.
 
Aurelius120 said:
They say
Can you post a link to where you have read this please? As @haruspex says, there are other considerations...
 

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