Rotational Dynamics A Nexus mindmap Linear motion 0 Rotational motion 1 Moment of inertia 2 2D rotation 0 Euler-Lagrange equations 1 Lagrangian 0 Principle of stationary action 0 Generalised co-ordinates 0 Examples 1 Using the Lagrangian 1 Rotating co-ordinate system 0 Newton's law in polar co-ordinates 1 [ The Bath-Tub Vortex in the Southern Hemisphere , Nature 207 , 1084 (1965)] 1 [ Bathtub Vortex , Nature 196 , 1080 (1962)] 0 refs 2 Rotating systems 2 Lagrangian 1 Central force 0 Central force solutions 1 Central force solutions 2 2 Central force solutions 3 3 Central Forces 2 Rotation in 3D 1 Rotations of rigid object 1 2 2 Rotations of rigid object 2 3 3 3 3 Euler equations 4 Stability of rotation 5 Rotating solid objects 3 0 Torque-free motion 1 [ Feynman's wobbling plate , Am. J. Phys. 75 , 240 (2007)] 0 refs 2 Feynman's plate 5 A square cat 0 [E. Putterman and O. Raz, The square cat , Am. J. Phys. 76 1040 (2008)] 0 refs 1 Square cat 4 Gyroscope 0 Heavy top 1 Gyroscope alternative 2 Gyroscopes and tops 6 Boomerangs 0 Boomerangs 7 Rotational Dynamics