As shown on the previous page
the result yielded by the rule
if angle is zero and angular velocity is zero then speed is zero
is:
The result yielded by the rule
if angle is zero and angular velocity is negative low then speed is
negative low
is:
The result yielded by the rule
if angle is positive low and angular velocity is zero then speed is
positive low
is:
The result yielded by the rule
if angle is positive low and angular velocity is negative low then speed is
zero
is:
These four results overlapped yield the overall result: