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Gravity. Sinkers go toward the ground faster because the spin put on them causes more air resistance on the top of the ball, pushing it downwards. Curve-balls and sliders also use air resistance to change direction or "break." A fastball stays straighter because the air resistance actually counter-acts gravity, pushing the ball upwards. Gravity is stronger though, and fastballs still sink a little bit.

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Q: Why doesnt a ball sink into the ground?
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