Name: TED-Ed】一位運動員用物理學打破世界紀錄--Asaf Bar-Yosef。 (【TED-Ed】An athlete uses physics to shatter world records - Asaf Bar-Yosef)
Uploaded: 2021-01-14T04:54:41.000Z
Duration: 3 min 51 s

程度副詞

Dick Fosbury tried his hand at almost every sport,

Dick Fosbury 幾乎遍嘗各種體育項目，

until, at the age of 16, he turned to the high jump.

直到 16 歲那年，他相中了跳高運動。

using the standard high jump techniques of the time,

Fosbury tried to jump a different way: backwards.

Fosbury 轉而嘗試與眾不同的方法：背躍。

Instead of jumping with his face towards the bar,

Fosbury improved his record by over half a foot,

如此使他的成績躍進了 15.24 公分，

by this strange new style of high jumping.

and assured his place in the 1968 Olympics in Mexico.

並在 1968 年墨西哥城奧運會 掙得了他的歷史定位。

In the Olympic Games, Fosbury amazed the world

在奧運會上，Fosbury 驚艷了全世界

with his new technique, winning a gold metal

並以他的獨門絕活一舉奪下金牌，

with an Olympic record leap of 2.24 meters.

還順便推進了奧會記錄，由 2.22 到 2.24 公尺。

almost all of the competing of high jumpers

新的背躍式跳法，或者 其傳世名號：Fosbury 的魚躍。

（flop 有重摔、失敗之意，為一個制勝絕技取這個不相稱名字的是一名記者，認為以彎曲的背部墜落軟墊，像上岸的魚亂跳 ）

we can locate the average position of all of its mass

考慮物體質量 在三維空間中的分佈情形

of a flat, rectangular object of uniform density

will be in the intersection of both diagonals,

We can find the center of mass for other objects

對於別的物體 我們可以透過類似的方法

or by finding the object's balancing point,

which lies right underneath its center of mass.

試試看，雙手虎口托著掃把的柄，

and slowly bringing your hands together until they meet.

並輕輕用力讓兩手往內滑動，直到手掌合十。

This balancing point lies right underneath

這時掃把應該還是平衡的， （試著想想看原理為何）

掃把的質心就在兩手正中上方某處。

講到人類，人體自然也有一個質心。

their center of mass is around the belly,

It moves all the time as you move through the day,

在你一天的活動中，你的質心據你的姿勢

甚至有些姿勢，會讓 你的質心位在身體的外部。

When you bend forward, your center of mass

質心會在你的腹部前（下）方，

in a place where there is no mass at all.

Weird to think about, but that's the average position

想起來似乎怪怪的，但它確實是這時

Now look at the Fosbury Flop, and follow the position

現在我們能回來看 Fosbury 的後躍了，

注意動作中運動員的質心位置。

可藉由最後的一蹬，將一部分的水平速度

在 Fosbury 登場以前，跳高的技術

為了將他們的質心抬到桿子以上數吋

The Fosbury Flopper doesn't have to do that.

但背躍式跳法迴避了這個瓶頸。

The genius of the Fosbury Flop is that the jumper

選手花同樣力氣，其質心和原本一樣高，

but raise his body much higher than before.

can't go any higher, his arching body can.

彎曲的身體卻可以由上方溜過去。

使選手的質心離身體越遠越好，

So the Fosbury Flop may be sports history's

因此可以說，Fosbury 絕技是運動史上

字幕列表影片播放

TED-Ed】一位運動員用物理學打破世界紀錄--Asaf Bar-Yosef。 (【TED-Ed】An athlete uses physics to shatter world records - Asaf Bar-Yosef)

bar

body

sport

leg