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Eh6794
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 TL;DR Summary

I am confused about the constraint I choose for my mechanics problems.
Let's say I have an inclined plane, a ball rolling off of a half hemisphere or a pendulum and I need to find a tension, friction or normal force.
After I derive the lagrangian, I need to find a constraint, but how do I choose a constraint?
I have worked through a couple of problems with solutions, but it seems like I find the coordinate/variable in the direction of the force I want? Ex. pendulum tension would be L?
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