Engineering Games: Crash Course Kids #29.2 - By Crash Course Kids
Transcript
00:12 | come on bird and yes , crashed . It just | |
00:17 | be the level that I've been stuck on for like | |
00:19 | a month . As any good gamer knows , it | |
00:21 | takes the right move to win one wrong move and | |
00:23 | poof . A possible wind can turn into a loss | |
00:26 | . The same thing is true for engineering . Last | |
00:28 | time we are thinking about the moves we could make | |
00:30 | that would guarantee the solution to our getting across the | |
00:33 | gorge problem was a success . And that included identifying | |
00:36 | variables or the conditions or values involved in the problem | |
00:39 | that can be changed . But what's the big deal | |
00:42 | ? Why do engineers identify variables when they're designing and | |
00:44 | testing solutions to a problem ? Wow . Remember we | |
00:51 | can control some variables like the height from which we | |
00:53 | drop a ball to see how high it bounces . | |
00:55 | But there are variables we can't control like gravity . | |
00:59 | Whether a solution to a problem turns out to be | |
01:00 | successful or not , depends on picking the right way | |
01:03 | to change of variables . The way something turns out | |
01:06 | like whether a solution solves the problem or not is | |
01:08 | called an outcome . So let's see how changing variables | |
01:12 | can change an outcome by playing a game . Mm | |
01:18 | The goal of this game is to knock down a | |
01:20 | pile of fluffy pink marshmallows . And to do that | |
01:22 | we launch cat bought into the pile using a slingshot | |
01:25 | . There are two variables here that we can control | |
01:28 | . We can change the angle of the launch and | |
01:30 | we can change how far we pull back on the | |
01:33 | slingshot . If we change either or both of these | |
01:35 | variables then we can get one of three outcomes . | |
01:38 | We can knock over all of the fluffy marshmallows , | |
01:41 | knock over some of the fluffy marshmallows or miss the | |
01:45 | pile completely . Now I don't want to be stuck | |
01:47 | on this level for another month . So I'm going | |
01:50 | for the complete knockdown outcomes . Try number one and | |
01:53 | I miss completely boo . So I'm going to change | |
01:57 | one variable the angle of the slingshot , but I | |
02:00 | want to pull back on the slingshot just as far | |
02:02 | as last time . Otherwise I won't be able to | |
02:04 | tell if the outcome of the second try is because | |
02:06 | I changed the angle or if I changed how hard | |
02:09 | I pulled . So let's see if changing the angle | |
02:11 | by pulling back just as hard as before gives me | |
02:14 | the outcome that I want and scored total knock down | |
02:17 | . Now if I wanted to for my second try | |
02:20 | I could have decided to change how hard I pulled | |
02:22 | on the slingshot . But if I did that I'd | |
02:24 | have to keep the angle the same bottom line . | |
02:26 | Engineers only change one variable at a time . Otherwise | |
02:30 | we can't tell why a solution works or doesn't work | |
02:37 | . So engineers don't just identify variables for fun , | |
02:41 | although it definitely can be they identify them so they | |
02:44 | can figure out which ones they can control . That | |
02:47 | is either change them or keep them the same and | |
02:49 | that's important to know because changing a variable can affect | |
02:52 | the outcome or result of a solution . So engineers | |
02:55 | change only one variable at a time when they test | |
02:58 | the solution so they're sure of the connection between the | |
03:00 | variable and the outcome . Now it's back to my | |
03:03 | game . I'm coming for you marshmallows . Yeah . | |
03:11 | Mm . |
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