Can you throw a knife that doesnt even rotate or spin

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Discussion Overview

The discussion centers around the feasibility of throwing a knife without it rotating or spinning, particularly in the context of portrayals in movies. Participants explore the mechanics of knife throwing, including different techniques and the realism of cinematic depictions.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Technical explanation

Main Points Raised

  • One participant questions how a knife can be thrown straight without rotation, suggesting that the mass distribution is not balanced.
  • Another participant emphasizes that movies should not be taken as realistic representations of physics.
  • A participant introduces the concept of "spear-style" knife throwing, which allows for a straight trajectory without rotation, noting its practical advantages in combat situations.
  • One participant references a website that critiques the physics in movies, expressing concern over the influence of such portrayals on public perception of physics.
  • A later reply suggests using movie errors as a teaching tool, highlighting the prevalence of unrealistic physics in films.

Areas of Agreement / Disagreement

Participants generally agree that movie portrayals of knife throwing are unrealistic, but there is a discussion on the validity and practicality of different throwing techniques, particularly the spear-style method. No consensus is reached on the original question of throwing a knife without rotation.

Contextual Notes

The discussion reflects varying assumptions about the mechanics of knife throwing and the influence of cinematic representations on understanding physics. The effectiveness of different throwing techniques remains a point of exploration without definitive conclusions.

AnthreX
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Specially in the movies... i see people throw knives at enemy's neck or the head
instantly killing them... some of the knife i saw.. fly straight without any rotations...

how can you throw a knife that doesn't even rotate or spin... and travel straight
with high velocity ? ( and the mass is not balanced in the knife, ofcourse metallic part would be heavier.
 
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You can do ANYTHING in a movie.
 
spear-style knife throwing

As Integral reminds us, don't take what you see in the movies as anything more than entertainment.

But there is a combative method of "spear-style" knife throwing that keeps the tip pointed towards the target without rotation. The advantage of spear style throwing is that it is less dependent on having exactly the right distance to the target: much more useful when you or your target is on the move. Compared to the conventional (and amazing) methods of circus knife throwers, it is a more realistic way to throw a knife under "combat conditions". (That is, if one were foolish enough to throw your knife in a life or death struggle! My advice: Hang on to that knife! :smile: )

Like anything else, it requires practice.
 
.. and to prove that what Integral has said is true, here is the Insultingly Stupid Movie Physics website:

http://www.intuitor.com/moviephysics/index.html

I would hate to think there are people who pay serious attention to the "physics" seen in movies.

Zz.
 
I love that site! Any teachers out there, here's a great activity: show one of these movies ("Eraser" is my favorite) and stop the movie whenever an egregious error occurs. The movie cannot be restarted until the error is explained (by the students).

Unfortunately, you can't do this with "The Core" because it would involve stopping the movie every three minutes.
 

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