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But a rubber tip lets you hit further right? I know it increases deflection and contact time, but you can hit farther with something that has highter COF

I shot at 2142FPS with those footage

I think it's a foul (but impossible to judge on the spot), the white didn't go in the direction you drew because it had topspin after bouncing off the cushion, and it hit the 3 really full, so the cue ball path looks like a soft follow shot with a full hit.

yeah, the tip or ferrule or shaft will contact the ball after the frist hit. Dr.Dave made one video on this You might not agree with the "miscue should be foul" statement but double hits do occur.

Yeah. One more thing that's possible to do might be to detect another hit to the CB shortly after (0.1 s maybe?) the first hit. Since all (observed) miscues involve multiple hits.

Does that mean that all the chalks Dr.Dave has tested all have COF~0.6 with the ball? That's why the miscue limits are all identical

How does it detect miscue?

Can't belive I accidentally have you all discovered a new feat! haha. I'll use "question" post in the future too.

I like that "mark as solution" feature

Yes. But Dr.Dave thinks it's not as simple as that, he said, https://forums.azbilliards.com/threads/premium-chalks-%E2%80%93-are-they-worth-it.558248/page-6 That's why I want to understand this more. Do you think the sliding friction explanation is the answer?

Thanks. I'm not make a billiard game, just curious what is the case in real-world situation. Can confirm that the tip-ball COF listed on Dr.Dave's webpage is for a chalked tip and the ball, NOT bare tip.

awesome!!!

No, and I don't intend to improve my skill by knowing it to begin with. You don't care doesn't mean no one cares.

Yeah, checking for direction of ball motion might be a better idea

So I'm still thinking about the miscue limit mentioned by Dr.Dave, and I'm wondering if anyone knows the COF (static and sliding) between the cue ball and a leather tip (chalked and no-chalk)? If not, I'll do an experiement myself and report up here.

If @nataddrho hasn't thought of this already, here is my thought on reporting miscue. If a miscue happens, the angular speed of the ball will be much less than the one predicted by physics. You can see Dr.Dave article https://billiards.colostate.edu/technical_proofs/new/TP_A-30.pdf Since...

To my understanding the pockets are supposed to be the same as snooker pockets. I know that they can be as tight as 82mm. As comparison, the 4 1/4 inch pockets on American pool table is 108mm wide

So I understand that when the shot is good, there's no sliding involved, hence no sliding friction. But when miscue happens, the tip slides, right? It seems that the two situations are very different.

I don't know about Dr.Dave's reputations among students, but from all the interactions I had with him, he's great. Also, there's a survivorship bias on websites like "rate my professors" since most students don't rate their professors, just like you won't likely rate a good restaurant, but you...

Right, but on the other hand, it seems that increase in friction doesn't help at all. I remember Dr.Dave said that from observations it seemed any increase in friction at this point doesn't prevent a miscue. So the reason might not be as simple as what I guessed.