# How to draw the velocity and acceleration diagrams if there is no connecting rod between the pins?

From the previous examples I've seen, there is a connection rod, for example, between a and c and then another rod from c to one of the pins. However, in this case, the rod ac is directly connected to another pin? I assume there is no relative velocity in this case. Is this assumption correct?

EDIT: By pins, I was referring to O2 and O8. I've just realised that C is a slider. I thought it was a rigid 'pin' like O2 and O8. Sorry for the confusion.

So I think I know how to approach this problem now. Va is perpendicular to OA. Vc is a horizantal line from O2. Vc/a is perpendicular to the rod AC starting from Va.Then I need to intersect Vc and Vc/a to find the magnitude of Vc. Is this approach correct?

EDIT 2: I'm running out of time. I quickly sketched this to check if I'm on the right track.

• Hi Alp, welcome to engineering.SE. It isn't clear to me what you are asking at the moment. What are the 'pins' that you refer to? Can you please expand your question by editing it to give it more context? – Chris Mueller Apr 7 '15 at 11:52
• sorry for the confusion. I think I know how to solve the question now. I'd appreciate it if you can double check. – Alp Apr 7 '15 at 12:03
• That is great, how about you post the solution so the community can provide feedback. Welcome to engineering.se – Mahendra Gunawardena Apr 7 '15 at 12:08
• draft solution added – Alp Apr 7 '15 at 12:15
• You can check your results with forceeffect.autodesk.com/frontend/fe.html by doing a kinematic analysis. – John Alexiou Apr 7 '15 at 20:53

I have had the same exercise in school, maybe it helps, you just know $B= 1/2 AC$, and you know C is in horizontal line from 0.