- Teknologia orokorra
- es rodadura
- eu errodadura
- fr rotation; roulement
- Teknologia orokorra
- es rotación
- eu errotazio
- fr rotation
rotation
- ca gir m
- de Drehen n; Schwenken n; Wende f
- es giro m
- eu bira
- fr giration f
- gl xiro m
- it giro m giro m
- pt rotação f
- ca rotació f
- de Rollen n; Umlauf m
- es rotación f
- eu biraketa
- fr rotation f
- gl rotación f
- it rotazione f
- pt rotação f
rotation
Rotation
Rotation or rotational motion is the circular movement of an object around a central line, known as axis of rotation. A plane figure can rotate in either a clockwise or counterclockwise sense around a perpendicular axis intersecting anywhere inside or outside the figure at a center of rotation. A solid figure has an infinite number of possible axes and angles of rotation, including chaotic rotation (between arbitrary orientations), in contrast to rotation around a fixed axis.
The special case of a rotation with an internal axis passing through the body's own center of mass is known as a spin (or autorotation).[1] In that case, the surface intersection of the internal spin axis can be called a pole; for example, Earth's rotation defines the geographical poles.
A rotation around an axis completely external to the moving body is called a revolution (or orbit), e.g. Earth's orbit around the Sun. The ends of the external axis of revolution can be called the orbital poles.[1]
Either type of rotation is involved in a corresponding type of angular velocity (spin angular velocity and orbital angular velocity) and angular momentum (spin angular momentum and orbital angular momentum).