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Post by Phaedrus on Apr 23, 2012 8:24:09 GMT -5
Next year they should bring a psychic. I mean, what does it really mean to be the ball? Is the psychic all that relevant to your question? maybe they should bring in a ball.
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Post by itsallrelative on Apr 23, 2012 8:28:28 GMT -5
Isn't there a slight non-uniform weight distribution to the ball, as well? Because of only having one stem?
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Post by vbgamer on Apr 23, 2012 8:56:29 GMT -5
There was an article on this very topic, I believe about 2 years ago either through AVCA or USA Volleyball. In the article it mentioned that a down float from 15-20 feet back ends up being as effective as a jump float. Had something to do with the velocity and angle of trajectory that gets put on the ball. We tried it in our gym and found it to be very successful. One down side is that after the serve you are much further from base.
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Post by lonewolf on Apr 23, 2012 9:21:23 GMT -5
I am not sure if it is physics so much as the timing of the serve/pass changes. The ball is in the air a lot longer, potentially traveling at a faster velocity, giving the passer a different look. Along with all of the physics discussed, this is also an important point. If the brain only has to worry about one type of serve (trajectory and speed) the brain adapts, and grows accustomed to it. Variations make it tougher to set patterns, which is why it's nice, if you can, to have different types of servers follow each other. By types I mean trajectory, speed, starting location, and type of serve.
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Post by Ralph Kramden on Apr 23, 2012 9:36:26 GMT -5
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Post by mikegarrison on Apr 23, 2012 9:39:27 GMT -5
Next year they should bring a psychic. I mean, what does it really mean to be the ball? After that you could bring in a philosopher and discuss What Is It Like To Be A Bat.
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Post by Phaedrus on Apr 23, 2012 9:42:05 GMT -5
Next year they should bring a psychic. I mean, what does it really mean to be the ball? After that you could bring in a philosopher and discuss What Is It Like To Be A Bat. Dude, pass the doobie.
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Post by Deleted on Apr 23, 2012 9:46:16 GMT -5
Herb = Herb Summers and he used to coach out at Pacific, right?
I wish I would've known there was someone else out at the AVCA interested in that stuff!
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Post by d3coach on Apr 23, 2012 9:51:05 GMT -5
I'm not sure what the difference really is. I've seen balls with side spin, go from right to left (or left to right). Whatever the effect, it again creates a very different look. I'm not sure what you define as "breaking" or "perception" but in reality it's certainly not going straight.
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Post by mikegarrison on Apr 23, 2012 9:59:54 GMT -5
I'm not sure what the difference really is. I've seen balls with side spin, go from right to left (or left to right). Whatever the effect, it again creates a very different look. I'm not sure what you define as "breaking" or "perception" but in reality it's certainly not going straight. This is a false dichotomy, caused by people not understanding acceleration. The spin of the curve ball generates an approximately constant force, which means it generates an approximately constant acceleration. Distance moved equals 1/2 * acceleration * time^2. So over the second half of the time the ball is in the air it moves three times as much as in the first half of the time the ball is in the air. This is why people think it "breaks" close to the plate. However, the actual acceleration of the ball is constant.
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Post by bigscrill on Apr 23, 2012 10:45:56 GMT -5
To my fellow gearheads (like Mike) out there, here is a question. Has anyone recently done any type of controlled studies on constant forces applied in equivalent conditions to the range of volleyballs that are used out there today? This was probably done some time in the past, but with everyone playing with different balls in 2012 and then re-standardizing to the organizational mandated equipment, this would seem quite relevant.
Thanks
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Post by Ralph Kramden on Apr 23, 2012 10:59:06 GMT -5
I'm not sure what the difference really is. I've seen balls with side spin, go from right to left (or left to right). Whatever the effect, it again creates a very different look. I'm not sure what you define as "breaking" or "perception" but in reality it's certainly not going straight. This is a false dichotomy, caused by people not understanding acceleration. The spin of the curve ball generates an approximately constant force, which means it generates an approximately constant acceleration. Distance moved equals 1/2 * acceleration * time^2. So over the second half of the time the ball is in the air it moves three times as much as in the first half of the time the ball is in the air. This is why people think it "breaks" close to the plate. However, the actual acceleration of the ball is constant. So a top spin serve is really one big arc? The floater however, actually can "move", correct?
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Post by Babar on Apr 23, 2012 11:37:39 GMT -5
Think of the volleyball as a wing responding to the same laws of physics that are applicable to flying. A ball that weighs less in proportion to it's size will be affected by air currents the most. Hence, a ping ball moves more than a volleyball but a basketball, with a heavier skin, moves less.
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Post by Babar on Apr 23, 2012 11:40:31 GMT -5
Think of the volleyball as a wing responding to the same laws of physics that are applicable to flying. A ball that weighs less in proportion to it's size will be affected by air currents the most. Hence, a ping ball moves more than a volleyball but a basketball, with a heavier skin, moves less. This is also why a Tachikara SV5 moves considerably more than a Molten.
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Post by mikegarrison on Apr 23, 2012 12:13:49 GMT -5
This is a false dichotomy, caused by people not understanding acceleration. The spin of the curve ball generates an approximately constant force, which means it generates an approximately constant acceleration. Distance moved equals 1/2 * acceleration * time^2. So over the second half of the time the ball is in the air it moves three times as much as in the first half of the time the ball is in the air. This is why people think it "breaks" close to the plate. However, the actual acceleration of the ball is constant. So a top spin serve is really one big arc? The floater however, actually can "move", correct? Yes and Yes.
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