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Through the ball is a line called the PAP or the initial axis of
rotation.
Source: http://www.real-world-physics-problems.com/physics-of-bowling.htm
This axis of rotation is measures as
soon as the bowling ball begins traveling.
While it is important to your results it depend
entirely on the way each
individual bowler throws his or her ball. Around the
PAP is the angular velocity.
This is how fast the ball spins as it goes down the
lane as is equal to the
change in the angle of the ball as it rotates over
the change in time. The finger
and thumb holes are generally places specifically in
reference to the PAP to
maximize the effect of the rotation at which the
ball is thrown.
Source:
www.yourdictionary.com