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leatherhead93 commented at 2014-01-14 08:09:05 » #1470821
The Laws of Physics have been slain....
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The Laws of Physics have been slain....
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Anonymous commented at 2014-03-20 21:31:02 » #1506345
No, really, they aren't. At the very least they're violating conservation of momentum by accelerating in midair.
Yes, gymnasts can increase their angular momentum by moving more of their mass closer to the center of the system. This only increases angular momentum; the actual total momentum of the system is the same, and the mass that was further out will still be moving at almost the same speed now that it's closer in. It just happens that this same tangential speed at a smaller radius results in a higher angular speed.
Likewise, extending the mass further out slows the system. Yuu's distance from the center of the system increases, so her angular speed should decrease rather than increase. Since it increases, she is seemingly gaining momentum (accelerating) out of nowhere, with neither a force acting upon her to cause the acceleration nor any other source of linear momentum to explain the increase in tangential speed near the top of the arc.
Keep in mind that the natural force that the ground exerts on you when you jump stops as soon as you stop touching the ground. Once you're in the air, the only forces acting upon you in a way significant enough to cause a noticeable change in speed are gravity and air resistance.
This would make a little bit more sense if they were in microgravity. However, that still doesn't account for Yuu's unexplainable increase in momentum, and unless there's some sort of switch which turns gravity on and off, they clearly are under the influence of gravity similar to Earth's since they fall flat to the ground at the end.
Gymnasts perform similar maneuvers, yes. However, being similar does not make them the same, and the ways in which they are different are the ways in which this violates physical laws.
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The physics are perfectly sound, actually.
No, really, they aren't. At the very least they're violating conservation of momentum by accelerating in midair.
Yes, gymnasts can increase their angular momentum by moving more of their mass closer to the center of the system. This only increases angular momentum; the actual total momentum of the system is the same, and the mass that was further out will still be moving at almost the same speed now that it's closer in. It just happens that this same tangential speed at a smaller radius results in a higher angular speed.
Likewise, extending the mass further out slows the system. Yuu's distance from the center of the system increases, so her angular speed should decrease rather than increase. Since it increases, she is seemingly gaining momentum (accelerating) out of nowhere, with neither a force acting upon her to cause the acceleration nor any other source of linear momentum to explain the increase in tangential speed near the top of the arc.
Keep in mind that the natural force that the ground exerts on you when you jump stops as soon as you stop touching the ground. Once you're in the air, the only forces acting upon you in a way significant enough to cause a noticeable change in speed are gravity and air resistance.
This would make a little bit more sense if they were in microgravity. However, that still doesn't account for Yuu's unexplainable increase in momentum, and unless there's some sort of switch which turns gravity on and off, they clearly are under the influence of gravity similar to Earth's since they fall flat to the ground at the end.
Gymnasts perform similar maneuvers, yes. However, being similar does not make them the same, and the ways in which they are different are the ways in which this violates physical laws.
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