## PSN-L Email List Message

Subject: A spring's constant
From: "tchannel" tchannel@............
Date: Sat, 22 Aug 2009 12:07:39 -0600

```   Hi Folks,  This question maybe a simple one........Is a spring's =
constant, its "stiffness"   I have a formulas for finding the constant, =
but I am unclear what it is.
As an example, I hung a spring, with no addition mass, and I measured =
how much force is required to pull it 2".   Next I add 100g of weight to =
the end of the spring, and measure the force it took to move it 2".   =
The force was now different.  Easier?   Is this the change in the =
springs constant?

I did this with several different weights, and using the formula =
K=3Dmg/x, I noted the different constants.   I was surprised that these =
numbers were not close, they were not "constant".

On one spring this K decreased as I added weight,   On a different =
spring the K increased as I added weight.

I also would like to a formula to find the frequency of a spring.

Please if you can, would you include an example, showing your math =
figures?   I am not very good at math and the examples help a lot.

Hi Folks,  This =
question=20
maybe a simple one........Is a spring's constant, its =
"stiffness"   I=20
have a formulas for finding the constant, but I am unclear what it=20
is.
As an example, I hung a spring, with no =
mass, and I measured how much force is required to pull it =
2".   Next=20
I add 100g of weight to the end of the spring, and measure the force it =
took to=20
move it 2".   The force was now different. =20
Easier?   Is this the change in the springs =
constant?

I did this with several different =
weights, and=20
using the formula K=3Dmg/x, I noted the different constants.   =
I was=20
surprised that these numbers were not close, they were not=20
"constant".

On one spring this K decreased as I =
weight,   On a different spring the K increased as I added=20
weight.

I also would like to a formula to find =
the=20
frequency of a spring.

Please if you can, would you include an =
example,=20
showing your math figures?   I am not very good at math and =
the=20
examples help a lot.

Thanks, Ted
```