# 理论力学

Hamiltonian Mechanics Sequence  Lagrangian and Hamiltonian Mechanics 视频   笔记 Newton's Approach 物体受到重力$$mg$$和tension $$T$$，牛顿力学告诉我们the equation of motion$$\sum \vec{F}=m \vec{a}$$，则是一个vector equation，但是我们只需要关注tangential component—that is, the component of the force and acceleration along the circle where the particle is constrained to move. \begin{array}{l} m \ddot{s}=-m g \sin \theta \\ s=l…

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