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iiJDSii
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Homework Statement
So there are 4 masses in a line. They are connected by 3 springs between them, denoted by k_12 & l_12 (spring coefficient + natural extension length), k_23 & l_23, etc.
Homework Equations
Write down the f = ma equations of motion for all 4 masses.
The Attempt at a Solution
See my image.
This problem really annoys me because I always learn how to do it for the test but never remember. I think I've gone through 3 courses where this problem came up and every time I could never remember. Well now it's just a random exercise in a linear algebra text I'm reading and I wouldn't mind learning it right once and for all. After all I'm supposed to be an engineer.
Thank you for any help.