not exist
exist
depend on position of crank
unpredictable
velocity^2 x crank radius
velocity x crank radius
(velocity/crank radius)
velocity x crank radius^2
along the angular velocity
opposite to angular velocity
may be any one of these
perpendicular to angular velocity
quick return mechanism of shaper
four bar chain mechanism
slider crank mechanism
(a) and (c) above
slider-crank mechanism
velocity polygon
acceleration polygon