Spring Constant and Spring Series

In summary, when springs are connected in series, the effective spring constant is less than the individual spring constants due to the inverse sum relationship. This is because the force in each spring is equal to the applied force, causing the total extension to be larger than that of a single spring. This can be derived using Hook's Law and assuming massless springs.
  • #1
Meadow_Lark
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I have a question about the spring constant of springs in series. Basically why is it less than the springs involved in the series? I know that when in series the spring constant is the sum of the inverse of each spring involved, but why?

thanks.
 
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  • #2
Meadow_Lark said:
I have a question about the spring constant of springs in series. Basically why is it less than the springs involved in the series? I know that when in series the spring constant is the sum of the inverse of each spring involved, but why?

thanks.
For springs in series, the effective spring constant is the inverse of the sum of the inverses of each spring constant, which with some algebraic manipulation works out to [itex]k_1k_2/(k_1 + k_2) [/itex]. Essentially, the force in each spring is the same as the applied force, from equilibrium considerations and free body diagrams. Google springs in series. The total extension of the system of 2 springs will be larger than if just one spring used due to the reduced effective stiffness of the longer relaxed length.
 
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  • #3
Can you derive the result? Start with Hook's Law. Assume massless springs so the force is the same on both, the deflection of the total must be the same as the sum of the extensions of the individual springs.
 

FAQ: Spring Constant and Spring Series

What is the definition of spring constant?

Spring constant, also known as the force constant, is a measure of the stiffness of a spring. It is defined as the amount of force required to stretch or compress a spring by one unit of length.

How is spring constant calculated?

To calculate spring constant, you need to know the force applied to the spring and the displacement caused by that force. The formula for spring constant is k = F/x, where k is the spring constant, F is the force in Newtons, and x is the displacement in meters.

What is the relationship between spring constant and stiffness?

Spring constant and stiffness are directly proportional to each other. This means that as the spring constant increases, the stiffness of the spring also increases. This is because a higher spring constant indicates a stiffer spring that requires more force to stretch or compress.

What is a spring series?

A spring series is a combination of multiple springs connected in a series. This arrangement allows for a larger overall spring constant, which results in a stiffer system. The formula for calculating the combined spring constant of a series is 1/k = 1/k1 + 1/k2 + 1/k3 + ..., where k is the combined spring constant and k1, k2, k3, etc. are the individual spring constants.

How does temperature affect spring constant?

Temperature can affect the spring constant of a material in two ways. First, an increase in temperature can cause the material to expand, resulting in a higher spring constant. Second, at higher temperatures, the atoms in the material vibrate more, which can cause a decrease in the spring constant. This effect is more significant in materials with a higher coefficient of thermal expansion.

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