Conceptual Dynamics - Independent Learning

General Planar Motion - Example Problem 4.3-5


Consider the four-bar linkage shown. If link CD is being driven with an angular velocity of 4 rad/s, determine the velocity of point P on link BC and the angular velocity of link AB at the instant shown.




  • ωCD = 4 rad/s
  • θ = 40o
  • lBC = 60 cm
  • lCD = 50 cm


Find: vB


Familiarize yourself with the system.
  • Note fixed points A and D.
  • Assign angular velocities.


Click on the figure after you have familiarized yourself with the system and drawn a schematic illustration.


Find the velocity of joint C using the relative velocity equation starting at joint D.