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…