# Shared Flashcard Set

## Details

Chapter 8
Rotational Kinematics
21
Physics
02/17/2015

Term
 axis of rotation
Definition
 a line defined by the center of a circular path
Term
 angular displacement
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
 degree
Definition
 a unit of measurement based upon 360 degrees in a circle
Term
 revolution (rev)
Definition
 one revolution equals one complete turn of 360 degrees
Term
Definition
 the SI unit for rotation
Term
 SI unit of angular velocity
Definition
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
 angular acceleration
Term
 SI unit of average angular acceleration
Definition
Term
 tangential velocity ("vector V sub T")
Definition
 the vector drawn tangent to the circular motion
Term
 tangential speed
Definition
 the magnitude of the tangential velocity
Term
 Angular quantities describe the motion of the _____
Definition
 entire object
Term
 uniform circular motion
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
 slipping
Term
 right-hand rule
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
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