Term
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Definition
| a line defined by the center of a circular path |
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Term
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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 |
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Term
| SI unit for angular displacement |
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Definition
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Term
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Definition
| a unit of measurement based upon 360 degrees in a circle |
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Term
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Definition
| one revolution equals one complete turn of 360 degrees |
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Term
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Definition
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Term
| SI unit of angular velocity |
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Definition
| radian per second (rad/s) |
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Term
| Angular velocity is positive when the rotation is _____ and negative when the rotation is _____ |
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Definition
| counterclockwise; clockwise |
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Term
| instantaneous angular velocity "omega" |
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Definition
| the angular velocity that exists at any given instant |
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Term
| instantaneous angular speed |
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Definition
| the magnitude of the instantaneous angular velocity, without reference to whether it is a positive or negative quantity |
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Term
| A changing angular velocity means that an _____ is occurring |
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Definition
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Term
| SI unit of average angular acceleration |
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Definition
| radian per second squared (rad/s^2) |
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Term
| tangential velocity ("vector V sub T") |
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Definition
| the vector drawn tangent to the circular motion |
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Term
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Definition
| the magnitude of the tangential velocity |
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Term
| Angular quantities describe the motion of the _____ |
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Definition
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Term
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Definition
| motion in which a particle moves at a constant tangential speed on a circular path |
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Term
| What does the subscript "T" indicate? |
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Definition
| a reminder that it is the tangential quantity |
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Term
| nonuniform circular motion |
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Definition
| circular motion in which the tangential speed is changing |
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Term
| The essence of rolling motion is tat there is no _____ at the point of contact where the tire touches the ground |
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Definition
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Term
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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 |
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Term
| The acceleration vector has the same direction as the _____ |
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Definition
| change in the angular velocity |
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