ELEMENTS OF PHYSICS I
Physics 221

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CHAPTER 8
Rotational motion

NEW CONCEPTS

FORMULAS

Angular velocity:

\begin{displaymath}\omega = {\Delta\theta\over\Delta t}\end{displaymath}

Angular acceleration:

\begin{displaymath}\alpha = {\Delta\omega\over\Delta t}\end{displaymath}

linear velocity:

\begin{displaymath}v = r\omega\end{displaymath}

components of linear acceleration:

\begin{displaymath}a_{tangential} = r\alpha\quad a_{radial} = \omega^2r\end{displaymath}

where r is distance from axis of rotation.

Frequency:

\begin{displaymath}f = {\omega\over 2\pi}\end{displaymath}

Period:

\begin{displaymath}T = {1\over f}\end{displaymath}

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