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Messenger - A hit pin which knocks down other pins. Also, a Columbia 300 bowling ball. Mid plane - This is a terminology used on drill sheets. It is also called the vertical axis line. It is the line that runs vertically through the PAP. Mill Hole - A hole which is drilled to determine the hardness of that particular bowling ball. Moment of inertia - This, by definition, is the resistance to rotating motion. Mathematically, it is equal to the mass times the distance squared. The further the mass is away from the rotation point the harder it is to rotate (or to slow down). It is interchangeable with radius of gyration as far as the effect to the ball reaction. |
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