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Spring Constant

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christianhood
#1
Dec12-09, 08:49 PM
P: 3
1. The problem statement, all variables and given/known data
A series of masses are hung from a vertical spring and the length is measured in each case to the nearest milimeter. Data below:

Mass : Spring Length
050g : 40.2cm
100g : 45.8cm
150g : 50.9cm
200g : 56.4cm
250g : 61.4cm
300g : 66.9cm
350g : 73.7cm
400g : 81.2cm

I need to find the spring constant.


2. Relevant equations

Fs = k | l - l0| ,
where
Fs = Spring Force
k = spring constant
l = length of spring
l0 = initial length of spring


3. The attempt at a solution
I know that Fs = Fg = mass / 100 (using g = 10 N/kg).
I just don't know how to get the constant because I don't know what the initial spring length is (it's not 0).
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AEM
#2
Dec12-09, 09:06 PM
PF Gold
P: 362
Think about the equation F = kX for a moment. What kind of graph does that make? What one of those letters represents the slope of that graph?

Can you put those hints together to figure out a way to determine the spring constant?
christianhood
#3
Dec12-09, 09:23 PM
P: 3
Quote Quote by AEM View Post
Think about the equation F = kX for a moment. What kind of graph does that make? What one of those letters represents the slope of that graph?

Can you put those hints together to figure out a way to determine the spring constant?
Oh, okay. It's the same for any initial length. Thanks :)


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