Physics of Baseball
Today most people can agree that the all time American sport is baseball (or at least it's tied with football). But few Americans really stop and think about all of the physics involved in the classic sport. For instance, in accordance with Newton's Second Law (that force equals mass times acceleration) the acceleration of a baseball is the force applied to it by the pitcher or the bat divided by the mass of the ball. Also, when the bat hits the ball, the bat recoils because for every action there is an equal and opposite reaction (which is Newton's Third Law).
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