Designing a Trial: Crash Course Kids #44.1 - Free Educational videos for Students in K-12

Designing a Trial: Crash Course Kids #44.1 - By Crash Course Kids

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00:09	if you've ever taken a math test , then you
00:11	know that sometimes close just doesn't count and guess what
00:14	close isn't what engineers shoot for when they're designing a
00:17	solution to a problem , Which is just fine by
00:19	me because I like my bridges to get the whole
00:21	way across the river . When engineers design a solution
00:24	to a problem , they focus on a specific outcome
00:27	. And if you've been following us on our engineering
00:29	adventures through gorges , piles of marshmallows , bowling alleys
00:32	and bridges , you know that in order to make
00:34	sure a solution meets that outcome , engineers do a
00:37	bunch of trials . But how do we put together
00:40	everything we've learned about engineering so far to come up
00:43	with a test that helps us get the result .
00:45	We want . What things do we need to think
00:47	about when we design trials ? Let's recap all of
00:55	the things we've gone over in the last few episodes
00:57	, even though our fabulous feats of engineering solve lots
01:00	of different kinds of problems , they all had some
01:02	things in common for each problem . We decided on
01:05	the criteria for a successful solution . These were the
01:08	rules . We used to judge whether our solution worked
01:11	or not . In the bowling alley . Our criteria
01:13	, we're getting all of the pins down and getting
01:15	them all down in one turn . We also identified
01:17	variables , those conditions that could be changed over the
01:21	course of the experiments , we learned that some variables
01:23	we can control and some we couldn't in the gorge
01:27	for example , we couldn't control gravity but we could
01:30	control the amount of weight . We were supposed to
01:32	get to the other side of the gorge . After
01:34	we pinpointed these variables , we isolated one variable that
01:37	we could control and we isolated that one because we
01:41	wanted to make sure that we knew why a solution
01:43	worked or didn't . So when we launched Cat got
01:45	into a pile of marshmallows , we only change the
01:48	angle of the slingshot between the trials and kept everything
01:51	else the same . Finally , the last thing we
01:53	did was learn how to identify failure points , Those
01:56	places where solution didn't work anymore . Then we tried
01:59	to fix those failure points , like we added some
02:01	extra support to our bridge . So both little Sabrina
02:03	and her bulldozer could get safely across . And it
02:06	was important that we do all of these things if
02:09	we didn't , we'd have a hard time making a
02:11	solution better if and when it didn't work . So
02:14	now let's put a whole bunch of steps together to
02:15	plan a set of trials using everyone's favorite carnival game
02:19	, The ring task first , we'll come up with
02:25	criteria for a successful outcome . If you've ever done
02:27	a ring toss , you know that you get a
02:29	couple of tries to get a ring around the pin
02:31	and I say go big or go home . So
02:33	let's aim to do it in one . So those
02:35	are our criteria , we get a ring around the
02:37	pin and we do it in one throw . Next
02:39	up , we identified the variables and isolate one to
02:42	change between trials . Well , let's see the ones
02:45	, we can change our , the size of the
02:46	ring , the distance . We stand away from the
02:48	pin , the size of the pin and how we
02:50	throw the ring . We can't do anything about gravity
02:53	, not that we want to , and there's no
02:55	wind . So let's say we choose to isolate the
02:57	size of the ring . We stand the same distance
02:59	away from the pin and use the same pin each
03:01	time and do our best to throw the ring the
03:04	same way each time . Now , step right up
03:06	, it's time to do some trials for trial one
03:08	, we'll start with a small ring , we'll throw
03:10	it and we'll miss for trial to we'll use a
03:14	medium sized ring close but still a no go for
03:18	the next trial will use an even larger ring bingo
03:21	. Pretty easy . Much easier than at the fair
03:24	. I'd have a lot of large stuffed animals if
03:26	it were that easy . Now , we need to
03:27	see if we can find any failure points . Mm
03:31	Let's try moving away from the pin , way far
03:34	away . We'll toss and we'll miss . So there
03:38	we have a failure point . The solution of using
03:40	a bigger ring works , but once we change another
03:43	variable and get too far away from the pin ,
03:45	a bigger ring isn't going to meet our criteria of
03:48	a successful solution . Mhm . So when we design
03:54	a solution to meet a specific outcome , we have
03:57	to make sure that we're paying attention to all of
04:00	the little details . After we decide what the criteria
04:02	are for a successful solution , we need to make
04:04	sure that we identify variables and isolate one to change
04:08	between trials and even want to trial gives us the
04:10	outcome we want . We still need to try and
04:13	find failure points so we can see if our solution
04:15	has any limits . But what if we want to
04:18	create more than one test ? Like you toss that
04:21	around in your mind until next time .

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