Yo-yo example from March 17 (rotational dynamics)
Helicopter example from March 17 (rotational collision)
Hip example from March 24 (static equilibrium)
Rolling soccer ball example from March 24 (rotational dynamics)
Spherical shell gravity example from March 31 (gravity)
Hollowed ball gravity example from March 31 (gravity)
Rocket-Earth-Moon example from April 7