***ASHL3Y***

=**circular motion**=
 * the movement of an object at constant speed around a circle with fixed radius.**



axis **-- stright line around which rotation takes places.**

rotation **-- object turns around an internal axis.**
 * ex. an ice skater.**

revolution **-- an object turns around an external axis.** linearspeed **-- distance/time** tangential speed **-- speed along a circular path** rotational speed **-- number of rotations per unit of time** tangetal speed **-- is radial distance times the rotational speed. (v=rw)** centripetal force **-- force that causes an object to follow a cicular path** centripetal acceleration **-- always point twards the center of the cicular motion.**
 * ex. the earth around the sun.**
 * rotational speed**
 * ex. carousel horses travel same rotational speed but different tangential speed.**
 * ex. force holding occapants safetly in a rotating carnival ride (f=mv2)**