Bowled Over - Isolating Variables: Crash Course Kids #39.1 - Free Educational videos for Students in K-12

Bowled Over - Isolating Variables: Crash Course Kids #39.1 - By Crash Course Kids

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00:09	you should know by now what's great about engineers ?
00:12	They solve problems all kinds of problems . I know
00:16	when we think of engineers , we think of big
00:18	problems like crossing Gorges , but consider things we use
00:22	every day to solve little problems . You probably remember
00:25	that one of the steps of the engineering process is
00:27	testing proposed solutions . And engineers always approach testing with
00:31	a plan . So let's check it out and see
00:33	what steps engineers take to test solutions , take it
00:37	away . Slingshot , Cat body . A few episodes
00:43	ago , Cat bought helped us play a game in
00:45	which our problem was to try to knock down a
00:47	big pile of fluffy marshmallows . We decided that we
00:50	could change one of two variables to accomplish this goal
00:53	. Either how hard we pulled on the slingshot or
00:56	the angle of the slingshot . So we started by
00:58	making our best guess at both variables and miss the
01:01	marshmallows completely . The angle and how hard we pulled
01:05	on the slingshot where the variables that made up our
01:07	first trial . When we missed the pile of marshmallows
01:10	, we needed a new plan so we decided to
01:12	change the angle of the slingshot and we also made
01:15	sure we didn't change how hard we pulled on the
01:17	slingshot . We said that we should only change one
01:20	variable at a time . Otherwise we wouldn't be able
01:22	to tell why our solution worked or didn't work .
01:25	Although we didn't know it , then this is called
01:27	isolating a variable . We're choosing one variable and giving
01:31	it a chance to be in the spotlight , We
01:33	choose it and it alone to change between trials .
01:36	So we chose a new angle and started the next
01:39	trial and this trial was successful down when the pile
01:43	of fluffy marshmallows officially , we can now say that
01:45	we met the criteria of a successful test criteria are
01:49	rules that are used to judge something in this case
01:51	. Our criteria for success where that we a knocked
01:54	over every single marshmallow and be did it all in
01:57	one shot . Let's see if we can name those
01:59	things in another game . I mean an investigation mm
02:04	Cat , but you get to be the cheering section
02:07	on this one . Little Sabrina , you're up in
02:10	this game . We're going bowling . We'll say that
02:12	the criteria for success are a knocking down the pins
02:15	and be doing it all in one turn . That
02:17	is getting a strike . Now , what are some
02:19	of the variables we could change ? Well , we
02:21	can change how hard we throw the ball and the
02:23	angle that we throw it and the mass of the
02:25	ball itself . Just to name a few . So
02:27	the next step is to isolate one variable to change
02:30	between trials . So how do we go about doing
02:33	that ? Let's say we choose the angle at which
02:35	we throw the ball to isolate this variable . We
02:38	have to make sure that all of the other possible
02:40	variables stay the exact same . How can we make
02:43	sure that the mass of the ball is the same
02:44	? That was easy . We'll just use the same
02:46	ball every time bam . Done . How about making
02:49	sure that we keep the speed of the ball the
02:51	same ? Well , that's harder . I could just
02:53	do my best to throw it down the lane the
02:55	exact same way every time cat bought you measure the
02:58	speed . Okay . My first throw was about 24
03:01	km/h . Not too shabby . Let me try again
03:04	. My second thought was only at about 22 km/h
03:08	, Maybe . 3rd time's the charm yikes . That
03:10	one was 21 km/h and my arm's getting tired .
03:13	Although my three values were close , they're not the
03:15	same . And that means that another variable the speed
03:18	of the ball would change during every trial . But
03:21	we want our isolated variable to be the angle the
03:24	ball rolls down the lane . So how else can
03:26	we keep the speed the same ? What if I
03:28	had a few friends come along ? If I had
03:29	some help , my arm wouldn't get as tired ,
03:31	but then that would introduce some other variables . My
03:34	friends are all really different , which is awesome ,
03:37	but not so good when it comes to trying to
03:38	keep a variable constant because my friends are different heights
03:42	and have different skills , it's not very likely that
03:44	they'll roll the ball the exact same speed as I
03:47	do . So that ideas out I know to help
03:50	us out . We'll use a ball ramp . All
03:52	I have to do is put the same ball on
03:54	the ramp each time and let gravity do the work
03:57	, variable isolation accomplished . So engineers said criteria or
04:05	rules when they're deciding if a solution to a problem
04:08	is successful . And to really know if a solution
04:11	meets these criteria , they have to isolate or choose
04:14	only one variable next time , you'll see how they
04:17	change that variable and only that variable between trials to
04:20	test the solution thoroughly . If the solution meets the
04:22	criteria , it's possibly on the path to being a
04:25	huge success .

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