Floating and Sinking: A Fish Full of Folly - By MITK12Videos
Transcript
| 00:16 | I love my face , but wait , what ? | |
| 00:20 | What's up with my fish ? Uh It seems to | |
| 00:25 | be swimming all day but it won't go down , | |
| 00:29 | not even if I push it and hey , what | |
| 00:34 | , What's up with that 1 ? It seems to | |
| 00:37 | be stuck down at the bottom , even if I | |
| 00:40 | lifted up , it falls straight down . This one | |
| 00:44 | stuck at the bottom and That one stuck at the | |
| 00:48 | top . Dude , what's up with my fish ? | |
| 00:53 | Maybe I need to learn something about sinking and floating | |
| 00:57 | . Hey heaven can you help me out today ? | |
| 01:01 | We're gonna learn about how some objects sink and some | |
| 01:04 | objects float . The reason that things sink or float | |
| 01:08 | depends on something called density . Density is how much | |
| 01:12 | something ways it's mass compared to its volume , how | |
| 01:16 | much space it takes up . So let's look at | |
| 01:18 | some examples here we have three balls , they all | |
| 01:23 | have the same volume , They will take up the | |
| 01:25 | same amount of space , but they all have different | |
| 01:27 | mass . They always something different . This one is | |
| 01:30 | filled with air , this one's filled with water and | |
| 01:34 | this one's filled the salt . Let's see . Let's | |
| 01:37 | make sure that they all weigh differently . The one | |
| 01:41 | filled with air weighs 55 g . The one filled | |
| 01:47 | with water weighs 451 g . And the one filled | |
| 01:52 | with salt Plays 654 g . This means these three | |
| 01:58 | balls , although they have the same volume , have | |
| 02:01 | different densities . So let's see what happens if we | |
| 02:04 | put them in the water . The one filled with | |
| 02:10 | air stays on top of the surface . It floats | |
| 02:13 | . This means the density of this fall is less | |
| 02:16 | than the density of the water that is sitting in | |
| 02:19 | . So even if we try to force it down | |
| 02:21 | below the surface , it comes right back up . | |
| 02:30 | The ball that's filled with water has the same density | |
| 02:33 | as the rest of the water . So what happens | |
| 02:37 | is neither sinking nor floating . It stays in the | |
| 02:40 | same position all the time and the one filled with | |
| 02:48 | salts , although it has the same volume as the | |
| 02:50 | other two has more mass and is more dense than | |
| 02:54 | this water , so it sinks straight to the bottom | |
| 03:00 | . As you can see some materials float and over | |
| 03:03 | the sink by combining different materials . Engineers can design | |
| 03:07 | vehicles , like boats and submarines that float or think | |
| 03:10 | as they want . There are two basic ways of | |
| 03:13 | controlling points . The first is by controlling the balance | |
| 03:16 | of materials that float with those that think Places . | |
| 03:20 | If I were to notice that one pen cap plus | |
| 03:24 | one two , the paper clips would float , But | |
| 03:31 | that one pen cap plus four paperclips would sink . | |
| 03:37 | Then I could simply design a device to remove one | |
| 03:40 | paper clip at the bottom , such that I could | |
| 03:43 | go down with four paperclips , Move one paper clip | |
| 03:54 | and go up with the paper clips . Another way | |
| 03:59 | of controlling quality is to control the materials themselves . | |
| 04:03 | For example , we already know that one pen cap | |
| 04:07 | , plus three paper clips , will float , but | |
| 04:13 | if we put it in this bottle and close the | |
| 04:15 | lid , we can actually make it sink simply by | |
| 04:18 | squeezing the bottle . Taking a closer look at this | |
| 04:21 | experiment . You can see that the air inside the | |
| 04:24 | pen cap gets squeezed too . This increases the density | |
| 04:27 | of the and makes it sink , releasing the pressure | |
| 04:30 | , makes it float , increasing the pressure , makes | |
| 04:33 | it sink . This use an organ in the body | |
| 04:36 | called a swim bladder to control their position in the | |
| 04:38 | water by expanding or contracting this organ fish can float | |
| 04:42 | or sink . It turns out that my fish had | |
| 04:45 | a problem with their swim bladders . One was too | |
| 04:47 | big and the other was too small , fortunately this | |
| 04:51 | is a fairly common problem , and my vet was | |
| 04:53 | able to fix it . Now . My fish and | |
| 04:56 | I are happy just like before , So we've learned | |
| 05:00 | some basic things about sinking and floating . But please | |
| 05:03 | join us for part two , where we will explore | |
| 05:06 | how engineers and scientists use this knowledge to design vehicles | |
| 05:09 | and explore cool places like the ocean . |
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Floating and Sinking: A Fish Full of Folly is a free educational video by MITK12Videos.
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