Average angular velocity (8-1)

Question 1 of 3

Question

Duration of the time inteval

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Question

$\textbf{Angular displacement}$ of the object during the time inteval (can be + or -)

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Question

$\textbf{Average angular velocity}$ of a rotating object over a time interval (can be + or −)

{"title":"Average angular velocity of a rotating object over a time interval (can be + or −)","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"5,39,44,74\"}]"} {"title":"Angular displacement of the object during the time interval (can be + or −)","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"267,11,298,45\"}]"} {"title":"Duration of the time interval","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"264,72,289,105\"}]"}

Review

Here $\omega$ is the Greek letter omega, and the $z$ in the subscript tells us that the blade is rotating around an axis that we call the $z$ axis (Figure 8-3). For any rotating rigid object, the value of $\omega_\mathrm{average}$ , $z$ is the same for all pieces of the object. The average angular velocity can be positive or negative, depending on the direction in which the object rotates. A common choice is to take counterclockwise rotation to be positive and clockwise rotation to be negative, but the choice is up to you.