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Angular Acceleration Problem

by Garen
Tags: acceleration, angular
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Garen
#1
Oct29-08, 11:03 PM
P: 32
1. The problem statement, all variables and given/known data




3. The attempt at a solution
I thought I could take the second derivative and get the angular acceleration from which I could use where ω is the angular velocity, is the linear tangential acceleration, and r is the radius of curvature. But for some reason, it didn't give me the right answer, anyone know where I went wrong?
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alphysicist
#2
Oct30-08, 12:36 AM
HW Helper
P: 2,249
Hi Garen,

Quote Quote by Garen View Post
1. The problem statement, all variables and given/known data




3. The attempt at a solution
I thought I could take the second derivative and get the angular acceleration from which I could use where ω is the angular velocity, is the linear tangential acceleration, and r is the radius of curvature. But for some reason, it didn't give me the right answer, anyone know where I went wrong?
Are you saying that you put in the tangential acceleration as your answer? If so, remember that they are asking for the total linear acceleration, and there is more to the total acceleration than just the tangential part.
livewire852
#3
Oct30-08, 12:44 AM
P: 3
aaaah thank you so much. i was totally stalking this post and you replied to it in a MOMENT OF PARADISE!!!!!

Garen
#4
Oct30-08, 12:52 AM
P: 32
Angular Acceleration Problem

Quote Quote by alphysicist View Post
Hi Garen,



Are you saying that you put in the tangential acceleration as your answer? If so, remember that they are asking for the total linear acceleration, and there is more to the total acceleration than just the tangential part.
Oh, I thought that total linear acceleration was only the tangential acceleration...Would I have to include centripetal acceleration? If so, how?
alphysicist
#5
Oct30-08, 12:56 AM
HW Helper
P: 2,249
Quote Quote by Garen View Post
Oh, I thought that total linear acceleration was only the tangential acceleration...Would I have to include centripetal acceleration? If so, how?
What is the formula for centripetal acceleration? (And remember that you have already found the angular velocity!)

Once you have found both components (the tangential and centripetal), the total is just the vector sum.
Garen
#6
Oct30-08, 01:02 AM
P: 32
Quote Quote by alphysicist View Post
What is the formula for centripetal acceleration? (And remember that you have already found the angular velocity!)

Once you have found both components (the tangential and centripetal), the total is just the vector sum.
I got it! Thanks a lot for your help.
alphysicist
#7
Oct30-08, 01:03 AM
HW Helper
P: 2,249
Quote Quote by Garen View Post
I got it! Thanks a lot for your help.
Sure, glad to help!


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