Justin+Cunnane

= Pitcher’s Windup =

I chose all the motions of a pitcher’s wind up to demonstrate three physic concepts which of **momentum, force,** and **acceleration**. First, **getting started**, the motion begins as the body coils. The pitcher raises the ball to cheek level, and then lifts his left knee above his waist, twisted in front of his trunk in a balanced position, ready to begin. Next, **the stride**, his legs start the chain. The right leg pushes off the pitching rubber. Simultaneously, his arms swing below his hips and apart like pendulums as his left knee goes forward and down. **Momentum**, after his front foot lands, energy is transferred to his pelvis, which begins to turn to face the batter. After a slight, momentum-building lag, his upper trunk follows, but his right arm is still back with the elbow flexed. **Acceleration**, as momentum from his trunk twist moves to his shoulder, it rotates forward. The elbow extends and straightens. **Release**, his wrist straightens as energy in his stretched elbow tendons whips the hand forward. His fingertips give the ball the final push and end up pointing straight down. **Follow-through**, His left knee straightens more as momentum bends his trunk further and carries his right leg forward. His trunk rotates so much that the batter can see his back, but he ends up in a balanced position.

__**Categories**__ Acceleration, Force, Momentum

Ellis, Steven. "Pitching Grips - How To Grip And Throw Different Baseball  Pitches." The Complete Pitcher. N.p., n.d. Web. 1 Nov. 2010.
 * __References__**
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 * Pollack, Nick. "How to Pitch a Baseball." Wiki How. N.p., n.d. Web. 29 Oct. **
 *  2010. . **


 * "How to Pitch a Baseball." eHow. N.p., n.d. Web. 2 Nov. 2010. **
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 * Picture from**:http://en.wikipedia.org/wiki/David_Riske

Miss Peterka's Comments: Looks like you copied the description from this page. http://www.nevadaappeal.com/article/20100801/SPORTS/100739888