lagrangian

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Pendulum – a third way

Looking back at part I of this idea, I don’t think I did a very good job. Let me summarize the key things I wanted to say: Normally, there are two ways of modeling the motion of an object: Calculating the forces on the object and using the momentum principle or Newton’s second law (which…

Mechanics an Example of the Pendulum

This post has been sitting in my mind for quite some time. Really, it is about mechanics – not about pendulums. What is the goal in mechanics (classical mechanics, if you like)? Generally, it is to find out how something changes over time. If you could get an equation of motion, that would do it.…