Term

Definition
a line defined by the center of a circular path 


Term

Definition
the angle through which a rigid object rotates about a fixed axis; denoted "delta theta"; the angle is swept out by a line that intersects the axis of rotation perpendicularly; positive if counterclockwise & negative if clockwise 


Term
SI unit for angular displacement 

Definition


Term

Definition
a unit of measurement based upon 360 degrees in a circle 


Term

Definition
one revolution equals one complete turn of 360 degrees 


Term

Definition


Term
SI unit of angular velocity 

Definition
radian per second (rad/s) 


Term
Angular velocity is positive when the rotation is _____ and negative when the rotation is _____ 

Definition
counterclockwise; clockwise 


Term
instantaneous angular velocity "omega" 

Definition
the angular velocity that exists at any given instant 


Term
instantaneous angular speed 

Definition
the magnitude of the instantaneous angular velocity, without reference to whether it is a positive or negative quantity 


Term
A changing angular velocity means that an _____ is occurring 

Definition


Term
SI unit of average angular acceleration 

Definition
radian per second squared (rad/s^2) 


Term
tangential velocity ("vector V sub T") 

Definition
the vector drawn tangent to the circular motion 


Term

Definition
the magnitude of the tangential velocity 


Term
Angular quantities describe the motion of the _____ 

Definition


Term

Definition
motion in which a particle moves at a constant tangential speed on a circular path 


Term
What does the subscript "T" indicate? 

Definition
a reminder that it is the tangential quantity 


Term
nonuniform circular motion 

Definition
circular motion in which the tangential speed is changing 


Term
The essence of rolling motion is tat there is no _____ at the point of contact where the tire touches the ground 

Definition


Term

Definition
grasp the axis of rotation with your right hand, so that your fingers circle the axis in the same sense as the rotation; your extended thumb points along the axis in the direction of the angular velocity vector; used to determine the direction of angular velocity 


Term
The acceleration vector has the same direction as the _____ 

Definition
change in the angular velocity 

