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Question involving spring constant

  • Thread starter Phenom66
  • Start date
1
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1. Homework Statement
We have a spring that is 30cm with a spring constant of 12000N/m
and there is a 65 kg weight put onto this spring. What is the new length of the spring?


2. Homework Equations
f = k *changeof* x


3. The Attempt at a Solution
I tried to take 65kg times 9.81 to find newtons (which is 637.65N)
so therefore 637.65 = 12000 *change of* x
and x = 637.65/12000
But something feels fishy about this, a spring doesnt move down just .053 m
 

AEM

Gold Member
360
0
1. Homework Statement
We have a spring that is 30cm with a spring constant of 12000N/m
and there is a 65 kg weight put onto this spring. What is the new length of the spring?


2. Homework Equations
f = k *changeof* x


3. The Attempt at a Solution
I tried to take 65kg times 9.81 to find newtons (which is 637.65N)
so therefore 637.65 = 12000 *change of* x
and x = 637.65/12000
But something feels fishy about this, a spring doesnt move down just .053 m
Think about it for a moment longer. How big is 637.65 N compared to 12000 N?

Then convert .053 m into centimeters. Now does it seem so unreasonable?
 

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