Chapter 4 - Kinematics in Two Dimensions - Conceptual Questions - Page 110: 14

(a) $\omega$ is positive and $\alpha$ is positive. (b) $\omega$ is negative and $\alpha$ is positive. (c) $\omega$ is positive and $\alpha$ is negative. (d) $\omega$ is negative and $\alpha$ is negative.

$\omega$ is positive when the object is rotating counterclockwise. $\omega$ is negative when the object is rotating clockwise. $\alpha$ is positive when the angular acceleration is counterclockwise. $\alpha$ is negative when the angular acceleration is clockwise. (a) $\omega$ is positive and $\alpha$ is positive. (b) $\omega$ is negative and $\alpha$ is positive. (c) $\omega$ is positive and $\alpha$ is negative. (d) $\omega$ is negative and $\alpha$ is negative.