Try Trials: Crash Course Kids #39.2 - By Crash Course Kids
Transcript
| 00:09 | Hey there , Future engineers who's ready for a little | |
| 00:12 | pin action at the lanes bully ? I'm talking about | |
| 00:16 | bowling anyway , it's finally time to test out the | |
| 00:18 | solution to our problem of how to get a strike | |
| 00:20 | at our neighborhood bowling alley . We know that engineers | |
| 00:23 | solve problems and that part of the process engineers used | |
| 00:26 | to solve problems involves deciding on and then testing a | |
| 00:29 | solution . So what exactly are the steps that engineers | |
| 00:32 | take to see if a solution really works ? Yeah | |
| 00:38 | , first you'll remember that . We talked about variables | |
| 00:41 | , things we could change in order to in this | |
| 00:43 | case get a strike in bowling . And we also | |
| 00:46 | set the criteria that we can use to determine if | |
| 00:48 | we get a strike in this case , those criteria | |
| 00:51 | are a we have to knock down the pins and | |
| 00:53 | be , we have to do it in just one | |
| 00:55 | turn a challenge maybe . But we totally got this | |
| 00:58 | now . We also said that as good engineers , | |
| 01:00 | we're going to choose one variable and isolate it and | |
| 01:03 | set it apart from all the other variables to see | |
| 01:05 | if and how it changes things . And the variable | |
| 01:08 | we chose to isolate was the angle of the ball | |
| 01:11 | in order to isolate this variable . We have to | |
| 01:13 | make sure that all of the other variables are constant | |
| 01:16 | . That is they didn't change that way . We'll | |
| 01:18 | know for sure what affect the changing of the angle | |
| 01:20 | of the ball has on the outcome , whether we | |
| 01:23 | get a strike or not . So we're keeping the | |
| 01:25 | mass of the ball consistent by using the same one | |
| 01:27 | every time . And we're going to keep the speed | |
| 01:29 | of the ball consistent by using a ball ramp . | |
| 01:31 | Now we're ready to perform a couple of trials to | |
| 01:33 | see if we can meet the criteria of our solution | |
| 01:36 | , all of which is a fancy way to say | |
| 01:38 | , let's go , mm . For our first trial | |
| 01:44 | , we'll aim the ball ramp so that the ball | |
| 01:46 | will roll directly down the middle of the lane . | |
| 01:48 | When we let the ball go , we see that | |
| 01:50 | we knock some pins over , but not all . | |
| 01:52 | We might be able to get them with a second | |
| 01:55 | try , but that would mean that our solution didn't | |
| 01:57 | meet both criteria . Let's give it another go . | |
| 01:59 | This time we'll change the angle of the ball ramp | |
| 02:01 | so that it's pointed pretty far on the right side | |
| 02:03 | of the lane , yanks gutter ball . We miss | |
| 02:06 | both criteria completely . Let's go with one more trial | |
| 02:10 | . This time we'll split the difference by setting the | |
| 02:12 | angle of the ramp so that the ball will hit | |
| 02:14 | the pins just slightly to the right of the center | |
| 02:16 | pin that did it . We met both criteria . | |
| 02:19 | We hit the pins and knocked them all down with | |
| 02:21 | one ball . A strike . Yes , yeah . | |
| 02:28 | Not only is doing several trials helpful at the bowling | |
| 02:31 | alley , but it's also an important part of the | |
| 02:33 | process that engineers use when solving a problem . After | |
| 02:36 | engineers figure out the criteria that a solution has to | |
| 02:38 | meet to be successful , they isolate one variable to | |
| 02:41 | test , then they change that variable between trials . | |
| 02:44 | And if the criteria are met , then the solution | |
| 02:46 | is a winner , just like we are at bowling | |
| 00:0-1 | . |
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