Hardware purchased at Arbor Scientific.   Alternate vendor for inexpensive physical demos: Pasco Scientific.
 
  Center of mass / period     Mass & stiffness     Angular momentum     Angular momentum     Angular momentum     Power/energy-rate: Gyro  
 
  Inertia & rolling (2D)     Gears & rolling (2D)     Rolling disk (3D)     Product of inertia  
 
  Collisions: Happy/sad balls     Collisions: Astro blaster     Collisions: Newton's cradle     Energy and forces: Magnetics