Axis:1 the imaginary line around which a large round object, such as the Earth. Centrifugal force:an apparent force that acts outward on a body moving around a center, arising from the body's inertia.
Centripetal force:a force that acts on a body moving in a circular path and is directed toward the center around which the body is moving. Linear speed:measured in distance units per unit time.
Revolution:a forcible overthrow of a government or social order in favor of a new system. Rotation:the act of rotating; a turning around as on an axis.