Question: probably easy cuz I'm in Junior High

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Discussion Overview

The discussion revolves around measuring tensile failure in hairbands by suspending weights until they break. Participants explore the concepts of tensile strength, the application of Newton's laws, and the relationship between weight and force in the context of the experiment.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant questions whether they can measure tensile failure using the load until the hairbands break and convert that to Newtons, given the lack of cross-sectional area data.
  • Another participant asserts that Newton's laws apply and clarifies that weight is a force, equating the applied force to weight unless gravity is altered.
  • A participant expresses confusion regarding the distinction between force and weight, referencing a source that explains their relationship.
  • There is a reminder to apply the load slowly to avoid dynamic effects on the specimen.

Areas of Agreement / Disagreement

Participants generally agree on the application of Newton's laws and the relationship between weight and force, but there remains some confusion about the definitions and implications of these concepts.

Contextual Notes

There are unresolved aspects regarding the measurement of tensile strength due to the absence of cross-sectional area data, and the discussion does not clarify the implications of measuring force versus weight in this experimental setup.

engineerwannabe
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I haven't had physics and want to measure tensile failure in hairbands (I'm a girl) by suspending weight from them until they break. I've figured out that I can't measure ultimate tensile strength or breaking strength because I don't have cross-sectional areas (I'm comparing styles). So can I accurately measure tensile failure using the load/weight until they break (in kg) and then convert to N? Do Newton's laws apply? Also, I am confused if I m only measuring weight because it is being pulled down in one direction or am I measuring force, which pulls in two directions?
 
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Newton's laws apply. Absolutely.

Weight is a force. Unless you have figured out a way to bend gravity, weight and the applied force are the same thing. You do have me a bit confused with the "force pulls in 2 directions" statement though (you're probably alluding to the fact that forces are vectors and are usually represented in 2D). Usually a tensile test is done so that gravity pulls along the long axis of the specimen. It should all happen along the same line.

Also, don't forget to apply the load very slowly. Don't let the dead weights drop on the specimen.
 
Thank you! That helps clarify!
I guess I got confused about force reading "A force is similar to a weight, but a force can act in any direction whereas a weight is a force that always acts downwards as a result of gravity." http://www.eng.newcastle.edu.au/eof/content/pdf/module2/sect2.3 .
 
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engineerwannabe said:
Thank you! That helps clarify!
I guess I got confused about force reading "A force is similar to a weight, but a force can act in any direction whereas a weight is a force that always acts downwards as a result of gravity." http://www.eng.newcastle.edu.au/eof/content/pdf/module2/sect2.3 .
No problem. You're welcome.

Just remember, weight is a specific case of a force.

Good luck in your experiments.
 
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