Defining Rotation and its Variables

Defining Rotation and its Variables - Defining Rotation and...

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Defining Rotation and its Variables We begin our study of rotational motion by defining exactly what is meant by rotation, and establishing a new set of variables to describe rotational motion. From there we will revisit kinematics to generate equations for the motion of rotating bodies. Rotational Variables It is possible, and beneficial, to establish variables describing rotational motion that parallel those we derived for translational motion. With a set of similar variables, we can use the same kinematic equations we used with translational motion to explain rotational motion. Angular Displacement The most important constraint placed on us when developing these variables is that they have to be a property of the object: any point on the object must have the same value for the variable. We therefore cannot use our old variables, such as velocity, because some parts of a rotating disk move at different speeds than others, and a single number for velocity would not describe the motion of the entire disk. So what is a property of every point on a rotating object? Since every
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This note was uploaded on 02/09/2012 for the course PHY PHY2053 taught by Professor Davidjudd during the Fall '10 term at Broward College.

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Defining Rotation and its Variables - Defining Rotation and...

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