measuring knee stress with hooke's law

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measuring knee stress with hooke's law

Postby vancan007 » Tue Jan 14, 2014 7:34 pm

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? The k variable being the spring constant of the spring...how do I find it? Please please please help! My project is due on Jan 24th!
vancan007
 
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Project Question: measuring knee stress with a mechanical model
Project Due Date: January 27, 2013
Project Status: I am conducting my experiment

Re: measuring knee stress with hooke's law

Postby Terik Daly » Fri Jan 17, 2014 8:11 am

Hi vancan007,

To calculate the spring constant, k, you will need to measure the force you apply to the spring to stretch the spring by a certain distance. Then, plug the force and distance into Hooke's law and solve for k. For example, let's say that I applied 10 Newtons of force to the spring, and the spring extended by 20 cm. Since

f = -kx
-f/x = k
-10 newtons/0.2m = k
k = -50 Newtons/meter
All the best,
Terik
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Re: measuring knee stress with hooke's law

Postby vancan007 » Thu Jan 23, 2014 9:44 pm

Thank you so much! :)
vancan007
 
Posts: 3
Joined: Mon Jan 13, 2014 9:35 pm
Occupation: student
Project Question: measuring knee stress with a mechanical model
Project Due Date: January 27, 2013
Project Status: I am conducting my experiment


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