The Physics of Baseball by Robert K. Adair

Author:Robert K. Adair
Language: eng
Format: epub
Publisher: HarperCollins
Published: 2013-04-04T16:00:00+00:00

THE SPIN OF THE BATTED BALL

For almost all bat-ball collisions, the line of momentum transfer through the ball does not coincide with the final direction of the ball’s flight, since the bat does not strike the ball perfectly squarely. The ball is rarely lined straight back to the pitcher, but is usually hit to the left or right, and on the ground or in the air. From such off-line impacts, the ball will leave the bat spinning, though it was not spinning originally. Figure 5.6 suggests the origin of the spin of a ball induced by an oblique collision with a bat by considering collisions with a simple, stationary, flat surface such as a wall. Here the ball traveling toward the plate with an initial velocity, ν, strikes the wall at an angle, Θ. The initial ball velocity can be divided into two components, as suggested by the diagram: νn is the component normal to the surface and νt is the part tangential to the wall; ν'n and ν't are the corresponding components of the rebound velocity ν'.

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