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Homework Help: Instant center of Velocity (check if I did it correctly) [solved]

  1. Nov 26, 2015 #1
    1. The problem statement, all variables and given/known data
    Velocity of point C = 0.2 m/s going down
    Find VB, VD, Angular velocity of BCD and Angular Velocity of AB

    2. Relevant equations
    Sine and cosine law

    3. The attempt at a solution

    Drawing of the question

    Please note that BCD is one link (L shape)
    Last edited: Nov 26, 2015
  2. jcsd
  3. Nov 26, 2015 #2


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    Your work looks good except for your calculation of vD at the end of your notes. Did you use the correct distance?

    Also, did you use the correct distance, r, when calculating ωAB?

    Also, since the question asks for velocities rather than speeds, you might need to include directions for the velocities.
  4. Nov 26, 2015 #3
    Looks right to me

    Ah, I see I didst use the correct radius. Thanks!

    Yea, I will put the direction in the end
  5. Nov 26, 2015 #4


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    Are you using the center of rotation of CBD to find vD?

    Your red arrow representing the direction of vD is incorrect.
  6. Nov 26, 2015 #5
    ok, so I am using the relative velocity to find VD.

    The red arrow for vd is Vd/B

    Vd is at point D going left an angle of 45 degree (assuming)
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