eli5 why are balls like footballs or baseballs more accurate when thrown with a spiral or spin?
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Perpendicular to dirrection angular velocity ( spin) helps with stabilisation. When something rotates the most relaxed point is in center and all mechanical interactions want to reach the most relaxed point (which in the end is a rest velocity). So when object meets anything that truea to change its direction and move center point away, the angular velocity is consumed first to fight this change.
That became a huge turning point in warfare. When guns shot bullets without added spin their accuracy and range was very limited.
Conservation of angular momentum (I think). Here’s the best example I can think of – [Veritasium](https://www.youtube.com/watch?v=GeyDf4ooPdo).
The point is that the spin gives it a crazy amount of stability.
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