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Circular Motion -the movement of an object at constant speed around a circle with a fixed radius Axis-straight line around which rotation takes place Rotation-object turns around an internal axis Revolution- object turns around an external axis

Ex.

Rotational Speed Linear Speed- distance/time Tangential Speed- speed along a circular path Rotational Speed- number of rotation per unit of time

Ex.

Tangential Speed- radial distance times the rotational speed V= rw

Centripetal Force -force that causes an object to follow a circular path

Ex.

Fnet=mv2/r

Centripetal Acceleration -always points toward the center of the cicular motion Period(T)-time needed for an object to make one complete revolution distance traveled= circumference centripetal acceleration=the velocity squared divided by the radius revolution-distance/circumference

Universal Gravitation and Mass - As the mass of either object or both object increases, the force of gravitational attraction increases - Newton's law of universal gravitation applies to all objects - As the distance of the 2 objects increases, the force of attractions is exponentially smaller