[Merry-go-round.](https://www.youtube.com/watch?v=_36MiCUS1ro) Spins at like 5 mph. Ball curves.
Earth. Spins at like 1000 mph. Ball goes straight.
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Because the Earth is so much bigger, meaning that the constant change in velocity caused by moving in a circle is next to completely unnoticeable.
You still can observe it with a pendulum that has a particularly heavy weight on the end, but not with something as simple as a ball lying on the surface of the planet.
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