The rotational (or XXXXXXX) acceleration XX XXXXXXX XX XXX XXXX XX change in XXXXXXXXX or XXXXXXXXX of XXX XXXXXXX XXXXXXXX. The XXXXXXXXXXXX has XXXX XXXXXXXXXX (XXXXX of view XXXXXXX straight ahead) XXX Perpendicular (point XX XXXX XXXXXXX towards XXX XXXXXX XX XXXX) components.
XXX Tangential XXXXXXXXX means "how much XX the insect's velocity changing in XXX direction directly XXXXX XX it". This XXXXXXXXX will be Zero, XXXXX the XXXXXX does not XXXXXX XXXXX XXX since the insect does XXX stop "XXXXX XXXXXXX/XXXXXXXX ahead" or change direction XX jumping XX the XXXX or XXXXXXXXX strange XXXX XXXX. For instance, XX you are XXXXXXX XX a XXXXXXXX XXXXX, you are XXXXXX running "straight ahead" XXX moving XXXX to side, usually at a XXXXXXXX pace.
XXX XXXXXXXXXXXXX component XXXXX "how much is the insect's velocity changing in XXXXXXXX XX the center XX XXX XXXX". Again, XXX insect and XXXX's angular XXXXX (i.e. XXXXXXXXX of XXXXXXXX) are XXXXXXXX XXX equal. XX XXX insect XXXX not XXXXXX speed. XXXXXXX, XXX XXXXXX'sXXXXXXXXXXX velocity is different XX XXXX XXXXXX, XXXX respect to the XXXXXX of XXX disc. XXX XXXXXX's XXXXXXXXX repeatedly XXXXXXX when XXXXXXX towards the center.
XXXXXXXXXX acceleration = Tangential + Perpendicular components
Therefore, XXXXX Tangential = 0, XXX XXXXXXXXXXXXX ≠ 0. XXXXXX XXXXXXXXXXXX ≠ 0 XXXXX XXXXXX XX accelerating