Fixing Failure Points: Crash Course Kids #42.2 - By Crash Course Kids
Transcript
| 00:09 | Hey , future engineers , I see you successfully made | |
| 00:12 | it back so we can learn more about why it's | |
| 00:14 | so important to fail when we're testing a solution to | |
| 00:16 | a problem . Last time we discovered that when a | |
| 00:18 | solution to a problem doesn't work anymore , it's called | |
| 00:21 | a failure point . But knowing the definition of a | |
| 00:24 | failure point isn't enough , engineers have to be able | |
| 00:27 | to spot failure points and then try to fix their | |
| 00:29 | solution . So those failure points won't be a problem | |
| 00:32 | anymore . So we got to ask , how do | |
| 00:34 | engineers find in fixed failure points in a solution they're | |
| 00:37 | trying to develop . Yeah , Well for one thing | |
| 00:43 | , when they're testing a solution , engineers don't just | |
| 00:45 | jump in randomly . They make a plan that is | |
| 00:49 | an organized series of steps used to accomplish a goal | |
| 00:51 | which in this case is a successful and safe solution | |
| 00:55 | . Now , at this point , you won't be | |
| 00:56 | too surprised to find out that this plan will include | |
| 00:59 | isolating a variable and then doing a series of trials | |
| 01:02 | or tests changing that variable each time until you find | |
| 01:05 | a solution that works . That's what we did at | |
| 01:07 | the bowling alley . Remember we isolated the angle of | |
| 01:09 | the ball ramp as a variable and then changed it | |
| 01:12 | until we got a strike success . But engineers don't | |
| 01:15 | stop there . They try to find any and all | |
| 01:17 | possible failure points that might come up so to see | |
| 01:19 | how we can sniff out any possible failure points . | |
| 01:22 | Let's go back to our little wooden bridge in the | |
| 01:24 | forest . I remember when we needed that bridge to | |
| 01:30 | cross the stream , we decided that the bridge could | |
| 01:32 | take us safely across the water , but not us | |
| 01:35 | and our bulldozer . But just guessing that the bridge | |
| 01:39 | can't support a bulldozer isn't good enough . Engineers would | |
| 01:41 | need to make a plan to test the bridge and | |
| 01:43 | see if they can find failure points . First . | |
| 01:45 | One way that engineers test the solution in its early | |
| 01:48 | stages is to build a small model of it first | |
| 01:51 | . So say we have the materials , we need | |
| 01:52 | to make a model of a bridge . Once we're | |
| 01:54 | done building it , we need to plan to test | |
| 01:56 | whether our bridge can hold a certain amount of weight | |
| 01:58 | or not . So let's keep track of how much | |
| 02:00 | weight the bridge holds as we pile weights on its | |
| 02:02 | deck , we'll keep adding , waits until we find | |
| 02:04 | the amount of mass that makes the bridge collapsed and | |
| 02:07 | down it goes . Now that amount of mass was | |
| 02:10 | less than our goal weight , which we need the | |
| 02:11 | model to support if the real life bridge was to | |
| 02:14 | hold up our bulldozer . So , guess what ? | |
| 02:16 | We've just identified a failure point . We have a | |
| 02:19 | specific weight at which the bridge is no longer a | |
| 02:21 | good solution . But before we dump our bridge idea | |
| 02:24 | and start again from scratch , let's see what happens | |
| 02:26 | when we change the existing design . Let's build the | |
| 02:29 | bridge again and this time add some extra support . | |
| 02:32 | Now , let's follow the same plan as before and | |
| 02:34 | keep adding weights to the model to see how it | |
| 02:36 | holds up . In this new trial , we see | |
| 02:37 | that the bridge holds our goal weight . In fact | |
| 02:40 | , the bridge holds even more than that . So | |
| 02:41 | far , it looks like our design could be a | |
| 02:44 | successful solution , but there are more possible failure points | |
| 02:47 | than not being able to support enough weight . Remember | |
| 02:49 | when we talked about the Tacoma narrows bridge , it | |
| 02:52 | was a perfectly fine solution to the problem , getting | |
| 02:54 | people across , puget sound at least until the wind | |
| 02:57 | picked up and hit the bridge at a certain angle | |
| 02:59 | . Then the bridge became good old galloping . Gertie | |
| 03:02 | twisting in the wind until it collapsed . So in | |
| 03:05 | that case the speed and angle of the wind made | |
| 03:07 | up the bridges failure point . So even though we've | |
| 03:09 | determined that our bridge can carry enough mass , we | |
| 03:12 | should still pick out and test other variables and try | |
| 03:14 | to find other failure points to make sure we've built | |
| 03:17 | the safest bridge possible . So let's review some of | |
| 03:19 | the steps that engineers go through when they're trying to | |
| 03:22 | find and fix failure points to figure out whether solution | |
| 03:29 | is successful , they make a plan or an organized | |
| 03:32 | series of steps to accomplish our goal . And part | |
| 03:34 | of this plan includes isolating a variable and then changing | |
| 03:37 | that one variable in a series of trials or tests | |
| 03:40 | , and once their solution fails , one of those | |
| 03:42 | trials , they found a failure point . So if | |
| 03:45 | you actually plan to fail , then you're not really | |
| 03:48 | failing . You're making your solution better . |
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