GATE ME 2016 Set 3 — Question 19
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Engineering Mechanics → Dynamics → Kinematics of Rigid Bodies
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Question
A rigid link is undergoing plane motion as shown in the figure ( and are non-zero). is the relative velocity of point with respect to point . 
Which one of the following is TRUE?
Correct answer
(D) V_(QP) has only one component perpendicular to PQ
Solution
For a rigid link, the distance between any two points and must remain constant during motion. This constraint implies that the component of the relative velocity along the line joining and must be zero (otherwise the link would be stretching or compressing). Consequently, the relative velocity vector must be entirely perpendicular to the link .
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