Down to Earth: Crash Course Kids #4.2 - By Crash Course Kids
Transcript
| 00:10 | Mhm . So you know that the earth is round | |
| 00:13 | and you know that gravity is the force that pulls | |
| 00:15 | objects down . But if the earth is round and | |
| 00:18 | there's stuff at the bottom of the earth , say | |
| 00:20 | a penguin in Antarctica , why doesn't gravity pull the | |
| 00:23 | penguin down off of the earth ? I mean does | |
| 00:26 | gravity really pull down when we talk about gravity ? | |
| 00:34 | And we say things like up or down ? We | |
| 00:37 | don't mean those things in the sense that you're used | |
| 00:39 | to in this case up just means away from the | |
| 00:42 | earth and down means toward it . So when you | |
| 00:45 | hear people say gravity pulls things down to earth , | |
| 00:48 | they really mean that gravity pulls things toward the earth | |
| 00:52 | . Now . Think of it this way , gravity | |
| 00:54 | is the force of attraction between any two objects made | |
| 00:56 | of matter . Right ? Well I have news for | |
| 00:59 | you , you're made of matter . And so is | |
| 01:01 | the Earth ? That means you and the earth have | |
| 01:03 | an attraction to each other ? Oh you guys , | |
| 01:07 | Anyway , the scientific argument for gravity is that any | |
| 01:10 | object that's on or close to Earth's surface and is | |
| 01:13 | made of less matter than earth will be pulled in | |
| 01:16 | by our planet . Stronger gravitational pull . Want to | |
| 01:19 | do a little demonstration mm hmm To show how Earth's | |
| 01:25 | gravity can pull an object like the penguin we mentioned | |
| 01:27 | before toward it . No matter where on earth that | |
| 01:30 | penguin is , all you need is a tennis ball | |
| 01:32 | and a rubber bands . Oh and your index finger | |
| 01:35 | . Now let's pretend the tennis ball is earth and | |
| 01:37 | the rubber band represents the force of gravity that makes | |
| 01:41 | your finger are adorable . Little penguin just chilling on | |
| 01:44 | the surface of the earth . Now stretch the rubber | |
| 01:47 | band around your tennis ball Earth and stick your finger | |
| 01:49 | under the rubber band . Now try to lightly pull | |
| 01:52 | your finger away from the ball . The penguin is | |
| 01:54 | trying to jump off the Earth even though penguins can't | |
| 01:57 | fly . What are you doing penguin ? But what | |
| 02:01 | happens ? Not much . Your finger doesn't get far | |
| 02:03 | before the rubber band pulls it back toward the ball | |
| 02:06 | , right . And the effect is the same . | |
| 02:08 | No matter where your finger penguin is on your earth | |
| 02:10 | ball , whether it's at the top or the side | |
| 02:13 | or on the very bottom , the same thing happens | |
| 02:16 | , the penguin is forced back to earth , no | |
| 02:17 | matter how hard it tries to jump off . So | |
| 02:20 | what does this mean ? Yeah , it means that | |
| 02:26 | no matter where on Earth an object is , the | |
| 02:28 | planet's gravitational pull will draw the object toward it . | |
| 02:31 | And that's how you should think about gravity . It's | |
| 02:34 | the force that pulls things toward Earth . So basically | |
| 02:38 | we have gravity to think for the fact that penguins | |
| 02:40 | stick to the bottom of the Earth and I , | |
| 02:42 | for one , am grateful . I like penguins . |
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