Rotation phenomena:
Like rotating flying chairs, merry-go-rounds, rotation of fan blades, operation of electric motors, wind power generation, movement of clocks, rotation of Ferris wheels, rotation of drivers Steering wheels, turning nuts by hand, wheel working, boomerang spinning, etc. are all rotational phenomena.
Some objects rotate spontaneously, such as the earth itself, which rotates around its axis and revolves around the sun (elliptical orbit); some objects are driven by external forces to rotate, such as air conditioner cooling fans.
Translation and rotation are phenomena that students often see in their daily lives. In a mathematical sense, translation and rotation are two basic graphic transformations.