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# Why doesn't the force of gravity change the speed of a bowling ball as it rolls along a bowling lane?

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Bowling ball is rolling on a horizontal surface. That means that it only has $\textbf{horizontal velocity}$. $\textbf{Gravitational force}$ only has a $\textbf{vertical}$ component. For a force to act on a body it would mean that it gives body velocity in the same direction as it acts on a body. Since bowling ball is firmly supported by ground its vertical speed reamins zero and since horizontal velocity of the ball is $\textbf{perpendicular}$ to the gravitational force, gravity will not accelerate the ball.

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