Kinematics using vector analysis

  • #1
61
0

Homework Statement



4e9b23fa04e6e173e3f349493846bf58.png


Homework Equations



Va = Vb + Va/b
Va = Vb + (wab x ra/b)

The Attempt at a Solution



OK so here is part of my solution:

e86f179e151f512dd5808025f06a411c.png


My velocity for B is correct according to the book. But I'm confused about D. The only problem here is that the velocity of D only has an i component, no j component. How do we know that and why is that? Also, how come the velocity of D isn't zero since it's a fixed point?
 

Answers and Replies

  • #2
Stephen Tashi
Science Advisor
7,642
1,495
Why do you think that D is a fixed point? At the time shown, D is at the end of CD and must move along the circle with center C since CD pivots about C. At the time shown, CD is vertical so the tangent vector to the circle is horizontal at that time.
 

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