Testing and Trials: Crash Course Kids #44.2 - Free Educational videos for Students in K-12

Testing and Trials: Crash Course Kids #44.2 - By Crash Course Kids

Transcript


00:09	Welcome back ring toss champions . You know , I
00:12	was thinking about our carnival game experiment from last time
00:14	and I think we're getting pretty good at using the
00:17	engineering process to come up with a solution to a
00:20	problem . So , good for us now , it's
00:24	time to mix things up a little . Sometimes engineers
00:27	figure out more than one way to reach a solution
00:29	to a problem . Think about our trip to the
00:31	bowling alley in order to solve the problem of getting
00:33	a strike . We use the ball ramp for every
00:35	trial . But what if someone else in another lane
00:39	was waiting to use the ball ramp ? Engineers aren't
00:41	just brilliant at solving problems . They're also excellent at
00:44	sharing . So in general , what if you don't
00:47	have what you need , whether it's the necessary equipment
00:49	or the right materials or enough money to make a
00:52	certain solution that works ? It means you got to
00:54	come up with another solution , and that means you
00:57	have to be able to test a bunch of different
00:59	possible solutions that all meet the same criteria . So
01:03	how do engineers design multiple tests of different solutions that
01:06	produce the same outcome ? Let's head back to our
01:13	ring toss game and see . We decided that the
01:16	criteria for our solution were first that we need to
01:18	get the ring around the pin and second that we
01:21	need to do it in one toss next , we
01:23	thought about the variables that could affect our outcome ,
01:26	like the size of the ring , the height of
01:27	the pin , how we toss the ring and how
01:30	far away we were from the pin . After some
01:32	thought we decided to isolate the ring size as our
01:34	variable and it was go time . We did three
01:37	trials using a smaller ring , a medium ring and
01:39	a large ring and it took the large ring for
01:41	us to get the outcome that we wanted and a
01:43	sweet grand prize . But that's not all being good
01:47	engineers . We kept testing our solution until we found
01:50	a failure point . We learned that if we changed
01:52	another variable , our distance from the pin , the
01:55	large ring wasn't going to solve the problem anymore .
01:57	Which is okay because I only have room for one
02:00	huge stuffed platypus in my room anyway , But let's
02:02	try to find a few different methods we could use
02:05	to get the same results . Mm And let's not
02:11	only make a plan , let's also make some tables
02:14	. Tables are a great way to keep everything organized
02:17	because we're going to be doing a few different tests
02:19	and we need a way to keep track of which
02:21	variable were changing in each tests . Now the criteria
02:24	for our solution are the same One ring , one
02:27	throw on the pin , booyah . So next let's
02:30	list are variables . They are ring size , distance
02:33	from the pin , the height of the pin .
02:34	And how we toss the ring overhand , underhand or
02:38	like a frisbee . Now we need to pick a
02:40	variable that we want to isolate . We already did
02:42	the ring size . So let's choose the distance from
02:44	the pin . So for our three trials will change
02:46	how far away we stand from the pin making it
02:49	12 or three m . Now we have to keep
02:52	all the other variables the same . So let's decide
02:55	what those are going to be . Let's choose the
02:57	small ring , the medium height pin and to throw
02:59	the ring underhand . Okay , little Sabrina start tossing
03:03	. When we do our trials , we see that
03:05	we get the outcome we want . When we stand
03:06	one m away from the pin test , one is
03:09	complete . For a second test , let's change the
03:12	height of the pin between trials . So we'll switch
03:14	between throwing the ring at a short pin , a
03:16	medium one and a tall one . We also need
03:19	to pick what we're going to use for the variables
03:21	that don't change . Let's stick with a small ring
03:23	and standing one m away from the pin and tossing
03:26	the ring underhand again . Ready , will me ?
03:28	This time we can see it's the tall pin that
03:30	gives us the outcome we're looking for . Okay ,
03:33	last test this time round , let's change how we
03:35	toss the ring between trials so we'll throw it underhand
03:38	one time over hand the other time and the last
03:40	time . Like a frisbee and all three times we'll
03:43	use the small ring , the tall pin and stand
03:46	one m away . Ready set toss When we do
03:49	our trials , we see it's the frisbee throw that
03:51	gets us the outcome we want . Now , if
03:53	we wanted to we can mix and match to create
03:56	any combination of variables that we were curious about .
03:59	Like we could try the frisbee toss with different pin
04:01	sizes or toss the ring differently , but only use
04:04	the short pin as long as we only change one
04:06	variable at a time and still get the outcome that
04:09	meets our criteria were totally golden . And now we
04:16	know that it's possible to design several different tests that
04:19	lead to the same outcome . We just have to
04:21	remember to make a plan to change only one variable
04:24	at a time and to keep things organized when in
04:27	doubt use engineering to solve problems . It will pass
04:30	the test every time .

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