Why is it harder to break tied spaghetti compared to separated spaghetti?

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Discussion Overview

The discussion centers around the question of why tied spaghetti is harder to break compared to separated spaghetti. Participants explore the mechanics involved in breaking spaghetti, including the role of force distribution and shear stress, while considering various setups and measurements.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the measurement of "harder to break" and whether the spaghetti breaks one-by-one when separated versus together.
  • Another participant suggests that the setup involves applying a mass to break the spaghetti, noting that more mass is needed when they are tied together.
  • A suggestion is made to draw a vector diagram to analyze the forces acting on the spaghetti in both scenarios.
  • One participant speculates that the increased difficulty in breaking tied spaghetti may relate to shear stress and force distribution across a larger area.
  • Another participant introduces the concept of moment of inertia and its relation to torque as a potential factor in the discussion.
  • A later reply proposes that when spaghetti is tied together, the angle of force application is zero, leading to less load distribution compared to when they are separated.
  • One participant concludes that the force is distributed along a larger area when spaghetti is tied, requiring a larger force to achieve the pressure needed to break it.

Areas of Agreement / Disagreement

Participants express various viewpoints regarding the mechanics of breaking spaghetti, with no consensus reached on the exact reasons for the observed phenomenon. Multiple competing explanations are presented, and the discussion remains unresolved.

Contextual Notes

Some participants note the importance of the specific setup and measurement methods, as well as the role of angles and force distribution, which may influence the outcomes discussed.

Umberto Tabalappi
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Hi fellow members,
I have one question for you that may seem basic and easy that is however concerning me: why when 3 spaghetti are tied together it is harder to break them than when they are separated by a certain distance?

Thank you in advance!

NB :Number of spaghetti and reparation don't really matter, just for the sake of quantifying.
 
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Umberto Tabalappi said:
I have one question for you that may seem basic and easy that is however concerning me: why when 3 spaghetti are tied together it is harder to break them than when they are separated by a certain distance?
One would have to know the exact setup and how "harder to break" was measured. When separated, do they break one-by-one, while breaking together when combined?
 
A.T. said:
One would have to know the exact setup and how "harder to break" was measured. When separated, do they break one-by-one, while breaking together when combined?
Alright, sorry for being unclear. The image is the set up for the spaghetti when they are separated and they break by applying a small mass. When the spaghetti are instead close together (no separatio) the mass needed to break them is bigger. Why is that?
 

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Umberto Tabalappi said:
Alright, sorry for being unclear. The image is the set up for the spaghetti when they are separated and they break by applying a small mass. When the spaghetti are instead close together (no separatio) the mass needed to break them is bigger. Why is that?
Draw a vector diagram for both cases, with the horizontal and vertical components of the force by the string on the outer beams. It's simpler with just two beams.
 
Sorry buy Ì don't understand how it can be helpful. I just want to know why when the three spaghetti are together you need more force to break them than when they are separated. Is it because they have less shear stress or something to this extent?
 
Umberto Tabalappi said:
Sorry buy Ì don't understand how it can be helpful.
Which is why you should do it.
 
Hahaha fairs but I don't know how to...
 
Try reading on the concept of moment of inertia...it has something in common with torque.
 
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  • #10
A.T. said:
I Think I have figured out a rough explanation. So, in the case of the separated spaghetti, even if we attach a lower mass an angle between the anchor point and the load is created. The angle is >0° and therefore more load is distributed on each anchor point. When the spaghetti are tied together the angle is =0° and therefore, up until a certain extent, even if we attach a heavier load, the distribution on the anchor point would be less than if the spaghetti were separated.
Is it somehow right?
 
  • #11
  • #12
Yes, Now it's all' much clearer. Thank you so much!
 
  • #13
Umberto Tabalappi said:
Hi fellow members,
I have one question for you that may seem basic and easy that is however concerning me: why when 3 spaghetti are tied together it is harder to break them than when they are separated by a certain distance?

Thank you in advance!

NB :Number of spaghetti and reparation don't really matter, just for the sake of quantifying.
Note: Spaghetti breaks due to large pressure not force.
When you tie together 3 spaghetti the force is distributed along a larger area compared to a single spaghetti, hence you need larger force to apply the pressure required to break the spaghetti. Therefore its harder to break it.
 

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