The Physics of Skydiving (Science Out Loud S2 Ep1) - By MITK12Videos
Transcript
| 00:02 | Yeah . Yeah . Yeah . Yeah . Yes . | |
| 00:17 | Mhm , mm hmm . Yeah , the MIT skydiving | |
| 00:42 | club just jumped out of an airplane . It might | |
| 00:45 | seem like a wild adrenaline rush . But actually there's | |
| 00:48 | a lot more to skydiving than just jumping out of | |
| 00:50 | a plane and pulling a red cord . Skydivers can | |
| 00:53 | control their falls . They can sit , track , | |
| 00:57 | flip fly , head down , make crazy hybrids and | |
| 01:02 | even fly over to each other to dock when you're | |
| 01:06 | just falling a few feet , there's not much you | |
| 01:08 | can do on the way down . So how is | |
| 01:11 | following thousands of feet through the sky any different ? | |
| 01:14 | You learn in school that things accelerate towards the ground | |
| 01:16 | because of gravity . But when things like skydivers fall | |
| 01:20 | for thousands of feet , another force becomes important drag | |
| 01:25 | . Gravity pulls cattle toward the earth . But as | |
| 01:28 | we fall , tiny air molecules bump into us . | |
| 01:32 | Each tiny bunk causes a little bit of force against | |
| 01:35 | her bodies . The hit from one air molecule may | |
| 01:38 | not seem like a lot , but when you add | |
| 01:40 | all those tiny forces up , you get a big | |
| 01:42 | force called drag which pushes up opposite to gravity . | |
| 01:47 | You can feel drag when you stick your hand out | |
| 01:48 | of a moving car window and the jumpers first leave | |
| 01:52 | the plane . There's not much drag acting against gravity | |
| 01:54 | so they accelerate towards the earth . As skydivers fallen | |
| 01:58 | speed up , the drag force grows and the skydivers | |
| 02:01 | feel the force of more and more air molecules . | |
| 02:03 | But with this comes control . And by positioning our | |
| 02:06 | bodies , we can stop flipping by pushing against the | |
| 02:08 | air . So what if banks and I want to | |
| 02:12 | jump together ? Can we follow the same speed ? | |
| 02:14 | Swati has a lot less surface area than me , | |
| 02:16 | So you'd think that she'd fall faster , but actually | |
| 02:19 | she's so much lighter than me that she has a | |
| 02:21 | tendency to fall slower , but by reducing how much | |
| 02:24 | surface area is exposed to the air molecules , I | |
| 02:26 | can reduce drag and keep up with banks drag can | |
| 02:31 | be used for more than just speeding up or slowing | |
| 02:34 | down . Moving your arms to the side and legs | |
| 02:37 | out generates extra airflow at your feet , which pushes | |
| 02:40 | your body in the direction it's facing . This is | |
| 02:43 | called tracking . To really use drag . Aaron needs | |
| 02:46 | to push you hard enough , which can only happen | |
| 02:49 | if you're going fast enough and that's why you can't | |
| 02:52 | track when you jump off the high dive at a | |
| 02:54 | swimming pool . Skydivers can also do things like turn | |
| 03:00 | in place to create formations with each other other positions | |
| 03:03 | , like sitting , standing and head down , change | |
| 03:05 | the surface areas , that jumper is exposed to the | |
| 03:07 | wind Since fewer air molecules hit their bodies in these | |
| 03:10 | positions , Skydivers can reach speeds up to 200 mph | |
| 03:15 | . Skydivers would prefer though to not hit the ground | |
| 03:17 | at 200 mph because they can't change the pull of | |
| 03:21 | gravity , They need to have as much drag as | |
| 03:23 | possible so they open a parachute . The large surface | |
| 03:28 | area of the parachute helps us to slow down so | |
| 03:31 | we can land safely scott . Having may seem like | |
| 03:35 | it defies the laws of physics , but in the | |
| 03:37 | end it's just playing with the wind . Mhm . |
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