Spaghetti Beam Breaking?

  • #1
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.
 

Answers and Replies

  • #2
A.T.
Science Advisor
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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?
 
  • #3
Umberto Tabalappi
6
0
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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  • #4
A.T.
Science Advisor
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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.
 
  • #5
Umberto Tabalappi
6
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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?
 
  • #6
A.T.
Science Advisor
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  • #7
Umberto Tabalappi
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Hahaha fairs but I don't know how to...
 
  • #9
russ_watters
Mentor
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Try reading on the concept of moment of inertia...it has something in common with torque.
 
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  • #10
Umberto Tabalappi
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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?
 
  • #12
Umberto Tabalappi
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Yes, Now it's all' much clearer. Thank you so much!
 
  • #13
the_valence_electron
3
0
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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