slider-crank mechanism

velocity polygon

acceleration polygon

four bar chain mechanism

inner dead centre

outer dead centre

right angles to the link of the stroke

all of the above

0

2

4

6

perpendicular to sliding surfaces

along sliding surfaces

somewhere in between above two

unpredictable

leads the sliding velocity vector by 90°

lags the sliding velocity vector by 90°

is along the sliding velocity vector

leads the sliding velocity vector by 180°