Experiment with heated stretched springs.

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Discussion Overview

The discussion revolves around the behavior of a steel spring when it is stretched and heated to high temperatures, specifically addressing the fate of potential energy in the spring and the implications of heating on its structural properties. The scope includes theoretical considerations of energy transformation, material science, and the effects of temperature on the physical state of materials.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant describes a scenario where heating a stretched steel spring to 700 degrees Celsius results in the loss of tension and a permanent change in its shape, questioning the fate of the potential energy.
  • Another participant explains that the "springness" of a spring is related to the fixed positions of its molecules and suggests that heating allows molecules to reposition, potentially leading to a new equilibrium state with lower potential energy.
  • A follow-up question is posed regarding whether the energy used to stretch the spring is released as heat when the spring is heated, indicating a curiosity about energy conservation in this process.
  • A brief confirmation is given in response to the question about energy release, but no further elaboration is provided.

Areas of Agreement / Disagreement

Participants express different aspects of the same phenomenon, with some exploring the implications of heating on molecular behavior and energy transformation, while others seek clarification on the energy dynamics involved. The discussion remains unresolved regarding the specifics of energy conservation and transformation in this context.

Contextual Notes

There are assumptions about the behavior of materials at high temperatures and the definitions of energy states that are not fully explored. The discussion does not resolve the complexities of energy transfer and the exact mechanisms at play during the heating and stretching of the spring.

Who May Find This Useful

This discussion may be of interest to those studying material science, thermodynamics, or mechanical engineering, particularly in the context of energy transformations and the properties of metals under stress and heat.

Low-Q
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I have a spring made of steel. The spring is stretched out, and kept in that position. There is now potential energy in the stretched spring due to tension. If I heat the spring up to 700 degrees celsius, the tension in the stretched spring disappear, and when the springs cools down it is permanently stretched, and I must apply energy to compress it into initial shape.

Where did the potential energy in the stretched spring go? Did I destroy energy or what happened?

Vidar
 
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do you know where the springness of a spring comes from, in the first place?

it has to do with the fact that it is a solid and the fixed position of its molecules.

when you stretch the spring and heat it up to a certain temperature...you are basically 'melting' it a bit and putting heat into the system to allow molecules to re-position (re-distant) themselves, release stresses and settle on a new position of minimum potential energy.

you may want to read up on metallurgical processes like annealing.

and yes, 700 degrees is just about the annealing temperature for steel.
 
gsal said:
do you know where the springness of a spring comes from, in the first place?

it has to do with the fact that it is a solid and the fixed position of its molecules.

when you stretch the spring and heat it up to a certain temperature...you are basically 'melting' it a bit and putting heat into the system to allow molecules to re-position (re-distant) themselves, release stresses and settle on a new position of minimum potential energy.

you may want to read up on metallurgical processes like annealing.

and yes, 700 degrees is just about the annealing temperature for steel.
Does this mean that the metal will release its tension as heat? Say I use 1J to stretch the spring, then the spring release 1J of heat when I heat it up?

Vidar
 
Yep.
 

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