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낙하산 놀이라고 들어보셨나요?
곰곰히 생각해보면, 한번쯤 소실적에 낙하산 놀이 한번쯤은 다 해보았을거라는 생각이 드네요.
낙하산의 원리를 이해하면, 조그마한 낙하산 정도야 쉽게 만들수 있답니다.
낙하산은, 공중에서 펼쳐지면, 우산과 같은 모양을 만들면서 천천히 내려오게됩니다.
떨어지때, 공기가 낙하산안으로 들어오면서, 일종의 부력이 형성하여, 하강속도를 감소시켜주곤하는데요.
동영상을 보면, 낙하산의 원리와 만드는 방법을 아실수 있을거에요.
미국 화상영어, 레슨업이 들려드리는 이야기는, 낙하산 놀이에 대한 이야기입니다.
영어자막과 함께 영어리스닝을 하거나, 쉐도우 스피킹을 하시면 영어공부에 도움이 될거에요.
자막이 안보이시는 분들은, 동영상 하단의 cc (자막)를 켜주세요.^^
레슨업에서는, 필리핀 전화영어가격으로, 미국 원어민선생님과 화상영어를 할 수 있습니다.
어휘 : parachutes 낙한산 / recess 휴식 / drag 항력
제목 : Parachute Adventure!! (낙하산 놀이)
Are you ready for some hands-on science?
Because today we’re making parachutes!
Have you seen parachutes where you live?
Maybe you’ve played with a parachute during recess.
Or maybe you’ve seen a skydiver make a safe landing because of a parachute.
But how do parachutes work?
They do their jobs thanks to something known as drag!
Drag happens when something moves through water or air.
When any object moves through the air, it pushes on lots of tiny air particles, and
those tiny air particles push back.
And you may not know it, but you experience drag all the time.
Have you ever been swinging on the playground and felt wind on your face?
That wind you’re feeling is drag!
Your body moves through the air, and hits the tiny air particles that are in the way,
and those tiny air particles push back on you.
A parachute works by making more drag.
For a skydiver, the parachute takes up more space than her body would alone, so more air
particles are pushing back to slow her, and the parachute, down!
So now that we know how drag works, and how parachutes use drag to slow things down, should
we create our own parachute?
Let’s take a look at a parachute and see what we’ll need.
For the parachute itself we’ll want something round and flat, and something that’s light
so it doesn’t pull us down instead of holding us up.
That’s a great idea Squeaks!
We'll use a coffee filter!
They're round, flat, and very light.
Next, what should our parachute be tied to?
I think it'd be fun to use a little cup so it can hold something,
like marbles, or maybe a little toy.
And to tie our cup to our parachute we’ll need some string.
Finally, let’s grab scissors... and... some tape. So we can easily put together our parachute.
First, let’s ask for some help from a grown-up to cut a three pieces of string.
And let’s make sure that each piece is the same length.
Alright, that's great.
Next, we’ll grab our coffee filter and tape the string around the outside edge.
For this step, it’s important that we space the string evenly around the filter, so that
there’s the same amount of space between each string.
After we’ve attached our string to the coffee filter, we’ll tape each end of the string
to the cup.
And here, too, we’ll want the strings to be spaced evenly around the top of the cup.
We’ve created a parachute!
And you know what’s next!
We get to go have some fun and test it!
Our friend Caitlin said that we could use her balcony to drop our parachutes, so we’ll
head on up there.
But, before you drop your parachute from anywhere, make sure that you get permission and ask
There are lots of places around your house that you can drop your parachute, like from the
top of a stairwell, or you can stand on a chair.
Ok, now that we’ve found a good place, we’re going to do a few tests to see how well our
First we’ll drop one of our little cups with no parachute attached.
Then we’ll drop the cup with the parachute attached to see how the parachute helps to
slow down our cup.
And finally we’ll put our favorite little toy in the cup to see if our parachute can
slow that down too.
Alright Squeaks, are you ready to see how the cup does on it’s own?
That was pretty quick.
And now let’s get our parachute ready for launch.
That was great!
The cup dropped more slowly this time, because the parachute created drag between its surface
and the air.
Ok, here’s our last test!
Let’s add our favorite little dinosaur figure to the cup and give it a go!
That was pretty fast!
The parachute we have doesn’t create enough drag to slow our toy down by very much.
And even though our parachute wasn’t strong enough for this toy, that’s ok!
We’ll keep experimenting!
I think we're going to try and make a bigger parachute, and maybe one made of a different material,
instead of a coffee filter.
And if your parachute doesn’t make enough drag the first time either, get creative!
Try out different materials and different sizes!
Did you have fun parachuting with us today?
We’re glad that you joined us, and we’re also happy that Google Making Science helped us
make this episode, so thanks Google Making Science!
To share your parachute photos and stories with us, grab a grown-up and leave a comment
down below, or send us an e-mail to email@example.com.
Thanks for joining us, and we’ll see you next time, here at the fort!
#전화영어 #화상영어 #원어민화상영어 #영어공부혼자하기 #영어공부 #영어회화 #영어회화학원 #생활영어 #영어뉴스 #스카이프영어
미국원어민 화상영어, 레슨업 홈페이지 : http://www.lesson-up.com/
레슨업 페이스북 : https://www.facebook.com/lessonupkr/
레슨업 트위터 : https://twitter.com/lessonupkorea
레슨업 블로그 : http://blog.naver.com/sleepyninja
레슨업 팟빵 : http://www.podbbang.com/ch/11314
레슨업 카카오 스토리채널 : https://story.kakao.com/ch/lessonup
레슨업 유투브 : https://www.youtube.com/c/레슨업글로벌영어회화