Finding Spring Constants After Cutting a Spring

In summary, the conversation discusses finding the spring constant of two equal parts of a spring that was originally given a spring constant of 8 N m-1. It is determined that the spring constant of each part is 16 N m-1, and it is explained that this is due to the decrease in length and increase in force constant when the spring is cut into smaller parts. The analogy of two capacitors is also used to further explain this concept.
  • #1
stpmmaths
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Homework Statement



A spring with spring constant 8 N m-1 is cut into 2 equal parts. Find the spring constant of each part?

Homework Equations





The Attempt at a Solution



Spring constant of each part = 16 N m-1
Above is the answer given.
1. Why should we times 2?
2. If the spring is cut into a ratio of 1:2:3, then what should be the spring constant of each parts?
 
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  • #2
Force constant is force required to produce unit extension.
In the spring for a given load, extension is proportional to the length of the spring. So when the length reduces, extension reduces and k increases.
 
  • #3
Hello. Consider the spring to be like two capacitors. 1/keq = 1/k + 1/k'. So in this case we consider the entire spring with keq to be the sum of two individual spring halves that have some other spring constant k where k = k' for this problem. Doing a bit of algebra shows that k = 2*keq.[
 
  • #4
Thanks a lot.
 

FAQ: Finding Spring Constants After Cutting a Spring

What is a spring constant and why is it important?

A spring constant is a measure of the stiffness of a spring. It is important because it determines how much force is needed to stretch or compress a spring by a certain distance.

How is a spring constant affected by cutting a spring?

Cutting a spring can change its spring constant depending on how much of the spring is cut. If the cut is made close to the ends, it can decrease the spring constant, making the spring less stiff.

What are the methods for finding spring constants after cutting a spring?

There are two commonly used methods for finding spring constants after cutting a spring: the static method and the dynamic method. The static method involves measuring the displacement of the spring and the force applied, while the dynamic method involves measuring the natural frequency of the spring.

How accurate are the results of finding spring constants after cutting a spring?

The accuracy of the results depends on the precision of the measurements and the method used. The static method tends to be more accurate, but both methods can provide reliable results if done carefully.

Can the spring constant change over time after cutting a spring?

Yes, the spring constant can change over time after cutting a spring due to factors such as wear and tear, changes in temperature, and stretching or compressing the spring beyond its elastic limit. It is important to regularly check and recalibrate the spring constant if it is being used for precise measurements.

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