Science Buddies: "Ask an Expert"

I built a model of the knee to measure the stress put on the patella. To do so, I must use hooke's law. I under stand that in f=-kx, x is the distance, but how do I find the k variable? I do not know the force and I don't know how much weight is pulling the spring. Is there a way to find out the spring constant? In the project tab, it does not tell how to find k, or what k is. Please please please help! My project is due on Jan 27th!

We noticed you posted the same question in the Life, Earth, and Social Sciences forum. Please only post one thread in one forum for your project, so that we can best help you. Since this question is more appropriate in the Life, Earth, and Social Sciences forum, we are closing this thread.

Thanks for using Science Buddies, and good luck with your project!