Angular velocity ratio theorem:
Which states that the angular-velocity ratio of any two
bodies in planar motion with respect to a third body is inversely proportional
to the segments into which the common instant center cuts the line of centers.
In other words, the ratio of the angular velocity of the
output link to the input velocity of a mechanism is inversely proportional to
the segments into which the common instant center cuts the line of centers.
Thus, in the four bar mechanism shown in below figure, links
L2 and L4 are the input and output links respectively, then
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