相关概念视频
01:10Energy Diagrams - II
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Energy diagrams are important to understand the dynamics of a system. The topology of an energy diagram helps illustrate the equilibrium points of the system.
The point in the energy diagram at which the system’s potential energy is the lowest is known as the local minima. The system tends to stay in this position indefinitely unless acted upon by a net force. The slope of the potential energy diagram at the local minima is zero, indicating that zero net force is acting on the system. The...
The point in the energy diagram at which the system’s potential energy is the lowest is known as the local minima. The system tends to stay in this position indefinitely unless acted upon by a net force. The slope of the potential energy diagram at the local minima is zero, indicating that zero net force is acting on the system. The...
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01:04Social Facilitation
32.0K
Not all intergroup interactions lead to negative outcomes. Sometimes, being in a group situation can improve performance. Social facilitation occurs when an individual performs better when an audience is watching than when the individual performs the behavior alone. This typically occurs when people are performing a task for which they are skilled.
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01:10Standard Deviation
16.8K
The most commonly used measure of variation is the standard deviation. It is a numerical value measuring how far data values are from their mean. The standard deviation value is small when the data are concentrated close to the mean, exhibiting slight variation or spread. The standard deviation value is never negative, it is either positive or zero. The standard deviation is larger when the data values are more spread out from the mean, which means the data values are exhibiting more variation.
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01:14Energy Diagrams - I
5.0K
The dynamics of a mechanical system can be easily understood by interpreting a potential energy diagram. Since energy is a scalar quantity, the interpretation of the dynamics of the system becomes even simpler.
Take the example of a skater on a parabolic ramp. The potential energy at different points along the ramp will be proportional to the height of the ramp, which varies quadratically with the horizontal position on the ramp. As the skater moves down the ramp from the highest position,...
Take the example of a skater on a parabolic ramp. The potential energy at different points along the ramp will be proportional to the height of the ramp, which varies quadratically with the horizontal position on the ramp. As the skater moves down the ramp from the highest position,...
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00:49Rigid Body Equilibrium Problems - I
4.5K
A rigid body is said to be in static equilibrium when the net force and the net torque acting on the system is equal to zero. To solve for rigid body equilibrium problems, do the following steps.
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01:21Rigid Body Equilibrium Problems - II
7.1K
A rigid body is in static equilibrium when the net force and the net torque acting on the system are equal to zero.
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
Consider two children sitting on a seesaw, which has negligible mass. The first child has a mass (m1) of 26 kg and sits at point A, which is 1.6 meters (r1) from the pivot point B; the second child has a mass (m2) of 32 kg and sits at point C. How far from the pivot point B should the second child sit (r2) to balance the seesaw?
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平衡错误评分系统 基于纪律的花样滑冰运动员的表现差异.
L Colby Mangum1, Andrew Skibski1, Luk Devorski1
1Kinesiology and Rehabilitation Sciences University of Central Florida.
International journal of sports physical therapy
|August 7, 2023
概括
艺术滑冰运动员.
科学领域:
- 体育科学和生物力学研究.
- 对运动表现和伤害预防的分析.
背景情况:
- 艺术滑冰需要特殊的平衡和姿势稳定来执行复杂的机动.
- 在旋转,跳跃和着陆期间保持控制在所有溜冰学科中至关重要.
研究的目的:
- 为了比较平衡错误评分系统 (BESS) 在艺术滑冰学科之间的表现.
- 调查滑冰运动员年龄和BESS表现之间的关系.
主要方法:
- 一项涉及358名不同学科的花样滑冰运动员的横截面研究.
- 在标准化运动组合中进行的平衡错误评分系统 (BESS) 评估.
- 使用3x6ANOVA和斯皮尔曼的rho相关性进行统计分析.
主要成果:
- 与单人和双人滑冰者相比,冰舞者在泡表面上表现出更多的错误.
- 与单人滑冰运动员相比,冰舞者和双人滑冰运动员在双重坚固的表面上显示出更多的错误.
- 在特定的BESS条件下,年龄和表现之间发现了弱负相关性.
结论:
- 姿势稳定性在不同的花样滑冰学科之间有很大的差异.
- BESS评估可以提供有关改善花样滑冰运动员表现的见解.
