Name: TED-ED】スピンとは一体何なのか？- ブライアン・ジョーンズ (【TED-Ed】What on Earth is spin? - Brian Jones)
Uploaded: 2021-01-14T04:43:43.000Z
Duration: 3 min 57 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

The next time you see a news report of a hurricane

showing high winds battering trees and houses,

ask yourself, "How did the wind get going so fast?"

Amazingly enough, this is a motion that started

But, to understand why, we need to understand spin.

In physics, we talk about two types of motion.

You push on something, and it moves forward.

The second type, spin, involves an object rotating,

An object in straight-line motion will move forever

like the friction of the ground beneath it,

The same thing happens when you get something spinning.

It will keep on spinning until something stops it.

If an ice skater is gliding across the ice

in straight-line motion and she pulls her arms in,

This is called the conservation of angular momentum.

Mathematically, angular momentum is a product of two numbers,

and one that gives the distance of the mass from the axis.

If you are riding on a spinning merry-go-round

You were the one who was following a curving path,

Oh, and you are riding on a speeding merry-go-round

The Earth spins on its axis once each day.

Now, that's a story that starts billions of years ago.

started to collapse as gravity pulled it all together.

like that ice skater pulling her arms in,

And everything that formed out of the cloud,

And this inherited spin is what gives us night and day.

And this day-night cycle is what drives our weather.

and it's warmer at the equator than at the poles.

If there's a region of low pressure in the atmosphere,

But the air curves to the right as it goes,

With the dramatic low pressure in a storm,

the air gets pulled in tighter and tighter,

and this is how we get the high winds of a hurricane.

So, when you see a spinning storm on a weather report,

The spin ultimately came from the spin of the Earth,

of the gentle spin of the cloud of dust and gas

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TED-ED】スピンとは一体何なのか？- ブライアン・ジョーンズ (【TED-Ed】What on Earth is spin? - Brian Jones)

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