Pedro Martinez, Boston Red Sox Image Source
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There are plenty of forces in baseball that take affect.
In order to strike out the batter, the pitcher has to apply a force to the ball. The speed and velocity of the ball is then determined by the pitcher. A pitcher can apply many different types of forces that cause the ball to do different unique things. For instance a pitcher can apply a force to the ball so that it sinks right as it gets close to the batter, making the batter think he will be able to swing at it. This is known as the curve ball. The pitchers arm acts like a lever giving him mechanical advantage allowing him to increase his force. Some pitchers can pitch a ball consistently at 99mph.
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