What is rotation?
Q: What is rotation?
A: Rotation is the movement of an object in a circular motion.
Q: What does a two-dimensional object rotate around?
A: A two-dimensional object rotates around a center (or point) of rotation.
Q: What does a three-dimensional object rotate around?
A: A three-dimensional object rotates around a line called an axis.
Q: What happens when the axis of rotation is within the body?
A: When the axis of rotation is within the body, the body is said to rotate upon itself, or spin– which implies relative speed and perhaps free-movement with angular momentum.
Q: What is a circular motion about an external point called?
A: A circular motion about an external point (for example the Earth around the Sun) is called an orbit or more properly orbital revolution.
Q: What is the difference between spin and orbit?
A: Spin is the rotation of an object upon itself, while orbit is the circular motion of an object around an external point.
Q: What is the line that a three-dimensional object rotates around called?
A: The line that a three-dimensional object rotates around is called an axis.
