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Homework Statement
4 springs with a mass on each end are connected in series as below:




m1




m2




m3




m4
All the masses are mass m, the length of each spring is 1, and the spring constant is k, find the extension of each spring.
Homework Equations
f = ky
The Attempt at a Solution
So basically if i label each spring extension as [tex]y_1, \ y_2, \ y_3, \ y_4[/tex] then the only forces are the spring pulling from above, the spring pulling from below and the force of gravity on each mass. So for example for the second mass m2 from the top the equilibrium equation would be:
[tex] 0 = ky_2  ky_3 mg[/tex]
If this is right I can solve the rest of the problem easily, but I'm just getting thrown off by my use of Newton's second law here.