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.

Given:

• ω_CD = 4 rad/s
• θ = 40^o
• l_BC = 60 cm
• l_CD = 50 cm

Find: v_B

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.