Why is the spring constant changed

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Discussion Overview

The discussion revolves around the behavior of the spring constant when the length of a spring is altered, specifically when it is halved. Participants explore the implications of this change within the context of Hooke's law and the properties of real materials versus ideal springs.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant suggests that the spring constant changes when the length of the spring is halved, proposing that it might be halved.
  • Another participant questions whether the spring constant is doubled instead when the length is halved.
  • A participant states that the answer depends on the type of spring, indicating that for real materials the spring constant changes, while for an ideal Hookean spring, it does not.
  • There is a challenge regarding the classification of Hookean springs as real materials, with references to the reduction in the number of coils affecting the spring constant.
  • Further inquiries are made about the definition of the spring constant and how force requirements change when the spring is cut in half, along with hypothetical scenarios involving stretching and combining springs.

Areas of Agreement / Disagreement

Participants do not reach a consensus on whether the spring constant is halved or doubled when the spring length is halved. The discussion reflects multiple competing views and uncertainties regarding the behavior of different types of springs.

Contextual Notes

The discussion highlights the dependence on definitions and the distinction between ideal Hookean springs and real materials, which may not be fully resolved. There are also unresolved questions about the implications of cutting the spring and how it affects elongation.

Pranav Jha
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what happens to the spring constant of a spring when it's length is halved? i think it has to change (guessing it is halved) but i don't know the physical reason which explains the change.

So, does the spring constant change or not when the length of the spring is changed (to be specific, when it is halved)? Please give a physically sound reason.
 
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or is the spring constant doubled?
 
The answer is it depends. In a real material yes, in a hookian spring the answer is no.
 
nnnm4 said:
The answer is it depends. In a real material yes, in a hookian spring the answer is no.

Isn't hookian spring a real material?
i just ran an internet search and the answers refer to the reduction in number of coils and thereby the same force when acting on half the number of coils increases the length by only half as much. Thus, the spring constant is doubled.
I think that makes sense and refers to springs following hooks law.
So, i couldn't get what you meant by differentiating between real material and hookian spring
 
Pranav Jha said:
what happens to the spring constant of a spring when it's length is halved? i think it has to change (guessing it is halved) but i don't know the physical reason which explains the change.
What's the definition of spring constant? How will the force required to get a certain elongation change when the spring is cut in half?

Another way to look at it: Imagine a spring of length L. If you stretch it by an amount ΔL, how much is each half of the spring being stretched?

Yet another way of looking at it: Imagine you hooked two spring together. For the same force, would the total elongation change? Would it be harder or easier to stretch the double spring?
 

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