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Homework Help: Planar Mechanics

  1. Mar 3, 2010 #1
    1. The problem statement, all variables and given/known data


    How do i calculate the velocity and accaleration of a point on a moving disk when i know the angular velocity , angular acceleration and radius of the disk?
    2. Relevant equations

    angular velocity 8k rad/s
    angular acceleration -10k rad/s2
    Radius 0.5m

    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 3, 2010 #2

    radou

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    Homework Helper

    What you wrote under "Relevant equations" actually belongs into the "The problem statement, all variables and given/known data" part. So, what are the relevant equations?
     
  4. Mar 3, 2010 #3
    Sorry about that. this is my first post.

    The relevent equations is what i am unsure about...
    I am considering using:
    v=wr
    Velocity = angular velocity x Radius

    and:
    a=xr
    Acceleration = angular velocity x Radius.

    I'm not certain if these are the correct equations to use. Just seems a bit straight forward.
     
  5. Mar 3, 2010 #4

    radou

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    Homework Helper

    You got the first relation right, but not the second one. The acceleration of the point equals angular acceleration times the radius.
     
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