The pole polar relationship is used to define the center of percussion of a planar rigid body.
2.
The center of percussion defines a place where, if the bat strikes the ball and the batter's hands are at the pivot point, the batter feels no sudden reactive force.
3.
In sports, the center of percussion of a bat or racquet is related to the so-called " sweet spot ", but the latter is also related to vibrational bending of the object.
4.
Research has shown that the dominant physical mechanism in determining where the sweet spot is arises from the location of nodes in the vibrational modes of the bat, not the location of the center of percussion.
5.
The part of the blade between the center of percussion ( CoP ) and the point is called the " foible " ( weak ) of the blade, and that between the center of balance ( CoB ) and the hilt is the " forte " ( strong ).
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