What is Gravity?

<동영상보러가기>

Description:

Gravity is an invisible force that pulls objects toward each other, which is why things fall to the ground instead of floating or rolling away. The Earth's strong gravity keeps objects grounded, while the moon's weaker gravity allows astronauts to jump higher, and the sun's gravity keeps planets in orbit around it.

중력은 물체를 서로 끌어당기는 보이지 않는 힘이기 때문에 물체가 떠다니거나 굴러가지 않고 땅으로 떨어집니다. 지구의 강한 중력은 물체를 고정시키는 반면, 달의 약한 중력은 우주비행사가 더 높이 점프할 수 있게 하고 태양의 중력은 행성을 궤도에 올려놓습니다.​

Transcription:

F: Hi pals. Ready? Watch this. So, why didit fall instead of float or even roll away?

F: Today, we're going to learn about gravity.

M: What is gravity?

F: Gravity is an invisible force that pulls objects.

F: A force is something that pushes or pulls something.

F: We have gravity right here on planet Earth.

F:  Gravity is the reason why objects fall to the ground when they get dropped or knocked over. When you jump, gravity is the force that brings you back down to the ground. And because the Earth is so big, …

M: …the gravity here is really strong.

F: Other places have gravity, too.

M: Gravity is a force across space.

F: For example, the moon has gravity, too.

M: But the moon is much smaller than planet Earth.

F: So, the gravity is not as strong. That's why when astronauts jump on the moon, they jump super high, …

M: …much higher than they could if they were jumping on planet Earth…

F: …because the gravity on the moon is not as strong. But there's one place that has the largest gravitational pull in our entire solar system.

F: That is the sun. The sun, the energy…

M: …and the center of our solar system.

F: The sun's strong gravitational pull is what keeps our planet and all the other planets in our solar system in orbit. We orbit around the sun because of the sun's gravity.

M: So, how long does it take to make a full lap around the sun?

F: That's a great question, Teddy. It takes about 365 days to go all around the sun or one year.

F: So, on New Year's, we're not only celebrating a new year, but we are celebrating another lap around the sun.

F: 안녕하세요, 친구들. 준비됐어요? 이걸 보세요. 왜 뜨거나 심지어 굴러가지 않고 떨어졌나요?

F: 그래서 새해에는 단순히 새해를 맞이하는 것뿐만 아니라 태양 주위를 한 바퀴 더 도는 것도 기념하고 있습니다. 

Question:

1. Why did the object fall instead of float or roll away?

2. How does gravity on the moon compare to gravity on Earth, and how does this affect how high astronauts can jump?

3. Why does the sun have the strongest gravitational pull in our solar system, and what does this force do?​​