  Question about ticktock in a pendulum clock  

   ticktock discussion  

   ticktock discussion continued 

  Lagrangian dynamics recipe  

  Lagrangian dynamics examples  

  driven dynamical system  

  Question about driven bead   

   driven sliding rotating bead  

   solution  

  Why Lagrangians are nice  

  The Hamiltonian  

  Example 1  

  Bouncing balls problem  
