How do dimples on a golf ball affect its aerodynamics?

spideykid7
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Homework Statement


What effects does the shape of a golf ball (dimples) have on its aerodynamics in comparison to a ball without dimples.
 
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You can read more about it here but you might need to look more into flow, drag and lift.
 
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In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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