# Homework Help: Confused on recieving just one K value for elongation and oscilliation

1. Oct 16, 2011

Confused on receiving just one K value for elongation and oscillation

1. The problem statement, all variables and given/known data

Ok. For lab, I had to place 5 different masses on a spring and calculate its initial and final position. I did this with a small, medium and large spring.

Then after I gathered my values, I made a graph, and fit a trendline through it.

The book says to use the slope and Hooke's law to find the K constant. However, when I use the slope and equation, I get very slightly different K constant values for the different masses on the same string. (like 4.311 for 0.05kg, and 4.317 for 0.06 kg).

How am I suppose to get just one K constant using the slope and equation? The book probably would have told me to average the K values if I was meant to get more than one.

Same scenario applies for the oscillation of the spring.

What should I do? Thanks.

2. Relevant equations

3. The attempt at a solution

Last edited: Oct 16, 2011
2. Oct 17, 2011

### Spinnor

The spring constant probably did not change. It was an experiment! There is going to be error (your numbers were still pretty close).

3. Oct 17, 2011