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Curved Motion: Pendulum

  1. Sep 10, 2009 #1
    1. The problem statement, all variables and given/known data

    The motion diagram shown in the figure represents a pendulum released from rest at an angle of 45 from the vertical. The dots in the motion diagram represent the positions of the pendulum bob at eleven moments separated by equal time intervals. The green arrows represent the average velocity between adjacent dots. Also given is a "compass rose" in which directions are labeled with the letters of the alphabet.

    pendulum.jpg
    Note: The letters in the diagram correspond to the directions.

    How can I find the direction of the acceleration of the object at moments 0 and 10?


    2. Relevant topics

    Circular Motion
    Acceleration and direction of object in motion



    3. The attempt at a solution

    First of all, I am having trouble find the velocity of said moments. Can someone help with this?
     
  2. jcsd
  3. Sep 10, 2009 #2

    rock.freak667

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    Homework Helper

    resolve the weight into components when it is at an angle θ. One should point in the towards the center.
     
  4. Sep 11, 2009 #3
    Anymore tips?
    Still can't figure it out. :/
     
  5. Sep 11, 2009 #4

    rock.freak667

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    Homework Helper

    ok at point 0, draw the weight downwards. Resolve the weight now. One component points away from the centre of rotation.
     
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