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Dynamics: Absolute and Relative Acceleration in Plane Motion

  1. Jun 10, 2015 #1
    1. The problem statement, all variables and given/known data
    zPRsg3f.png

    A force P is applied to the rod which rests on a horizontal table. The following accelerations are produced. aA= 3.6m/s2 to the right, α of the rod = 6 rad/s2 CCW. Determine the acceleration of point G and B

    2. Relevant equations
    aG=aA+aG/A
    aG=aA+[(aG/A)tangential + (aG/Anormal)]
    aG=aA+[(α X rG/A) + ( ω2 * rG/A)]

    3. The attempt at a solution
    So I tried to solve the problem and quickly found that there is no way to solve for angular acceleration (ω). Looking at the solution they completly leave out the normal component of acceleration to solve for the acceleration at G and A. They just plug in values for acceleration at A, angular acceleration and distance from A to G.

    I cant figure out why there is no normal component of acceleration in this problem.
    Any help?
    Thanks!
     
  2. jcsd
  3. Jun 10, 2015 #2

    haruspex

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    is there a force parallel to AG?
     
  4. Jun 10, 2015 #3
    No only the forces that are show. The evaluation of the question only involves the accelerations
     
  5. Jun 10, 2015 #4

    SammyS

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    Do you know how to work with the center of mass ?
     
  6. Jun 10, 2015 #5

    haruspex

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    Then why should there be an acceleration in that direction?
     
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