Generación de movimiento en el cuerpo
Diploma del Bachillerato Internacional · IB Diploma · Sports, Exercise and Health Science · HL Tema 4 1:11 Narración en inglés · Subtítulos en inglés + 中文 quemados en pantalla
Capítulos
Transcripción
These are selected topics, not the whole syllabus, and every example is fictional.
这些是精选主题，不是完整大纲，所有例子都是虚构的。
Impulse links force and time to a change in momentum.
冲量把力和时间与动量变化联系起来。
A landing must remove 150 kilogram metres per second of momentum.
落地时要消除 150 千克·米/秒的动量。
Stopping in 0.30 seconds needs an average force of 500 newtons.
0.30 秒内停下需要平均 500 牛的力。
Bending the knees stretches the stop to 0.60 seconds: 250 newtons.
屈膝把停止时间延长到 0.60 秒：250 牛。
The two shaded areas are equal, because area under force against time is the impulse.
两块阴影面积相等，因为力-时间图下的面积就是冲量。
Stability depends on the centre of mass and the base of support.
稳定性取决于重心和支撑面。
A narrow stance gives a small base: a small lean moves the line down from the centre of mass outside it, and the athlete topples.
窄站姿的支撑面小：稍一倾斜，重心向下的垂线就落到支撑面外，运动员就会倒。
A wide, low stance enlarges the base and lowers the centre of mass, so the same lean stays inside.
宽而低的站姿扩大支撑面、降低重心，同样的倾斜仍落在支撑面内。
Check yourself.
自我检测。
120 over 0.4 seconds is 300 newtons.
120 ÷ 0.4 秒 = 300 牛。
Over 0.5 seconds it is 360 newtons; over 1 second, 180.
0.5 秒时 360 牛；1 秒时 180 牛。