Sliders use a different subset of physics than curves.
They really don’t (at least in my observation of a lot of both). The spin is not meaningfully different between a softball curve and a baseball slider. The reason is that no one, or almost no one, throws a true 9-3 curve in softball (where the axis is perpendicular to the ground). The axis points up and to the glove slide (in most cases), and then it truly is just like a slider. In others, the curve has more rise in it, so the axis points up and arm side. Either way it has a strong gyro component.
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