The Physics of Unicycling - Free Educational videos for Students in K-12

The Physics of Unicycling - By MITK12Videos

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00:06	Have you ever seen somebody unicycling maybe ? Wondered how
00:09	does anybody balance on that thing ? Maybe like I
00:11	got this and try it yourself . But if you've
00:13	ever tried unicycling , you'd probably agree that riding on
00:16	one we all doesn't start easy . So how does
00:18	anyone balance on you know , cycle ? Well ,
00:21	the simple answer is you just keep pedaling . I
00:23	mean honestly things in motion tend to stay in the
00:25	same motion . The scientist named Nunes said that if
00:27	all the forces magically cancel each other or there's no
00:29	forces at all , an object just keeps going .
00:32	Unfortunately , that's not enough to really answer how someone
00:35	can use cycle . I mean , forces don't magically
00:37	cancer each other . The big problem is very gravity
00:40	. Gravity just pulls us to the ground . It's
00:42	a force and forces can change the way we move
00:44	. This was also realized by New Nunes said that
00:47	all the forces added together . Say how an object
00:49	. Well , sorry , the sum of all the
00:51	forces is called the net force . This net force
00:55	is equal to the object's mass times acceleration , ensure
00:59	net force equals mass times acceleration . So let's use
01:02	the net force equals mass times acceleration to see what
01:04	makes unicycling so hard . Here's a unisex on a
01:07	uni and we want to draw all the external or
01:09	outside forces . Well , we have gravity right gravity
01:14	pulls downward so we can just draw an arrow down
01:16	. Great . We got one for strong . That's
01:19	a good start . But something is missing right now
01:23	, the net force is just downward and so it
01:24	would simply accelerate or practically free fall downward . What's
01:27	up is from falling . It's a conduct force .
01:30	There's a conduct force between the ground and the you
01:32	know , cycle the ground literally pushes you up .
01:35	Don't believe me try falling , You'll really feel the
01:38	ground . When you add , we call this special
01:40	contact force a normal force . Both Voila looks like
01:43	our uni , cyclist is finally balanced , but there
01:45	is one more significant force . It plays a huge
01:47	role in unicycling . I'll give you a hit .
01:50	Could somebody units like on ice ? Not easily .
01:53	There's another force between the ground and the , you
01:55	know , cycle . And that's friction , friction is
01:58	a force that ultimately helped us speed up , slow
02:00	down and turn and all those movements are necessary to
02:03	balance . That's because the , you know , cyclist
02:06	is an unstable equilibrium , unstable equilibrium means that if
02:10	I'm perfectly upright , I'll stay upright , but as
02:14	soon as I start to tip over , I'm going
02:17	to fall . One way of moving to keep ourselves
02:20	and falling is do something called counter steering . And
02:23	counter steering is about moving the point of contact with
02:26	the ground . I need to change where the point
02:28	of conduct is , so I can stay upright .
02:30	Counter stand is really about making terms , which is
02:33	for the novice , you know , cyclist , a
02:35	major challenge . So here's the question , what does
02:38	a unisex list I have to do to make a
02:39	turn ? Well when I want to turn , I
02:42	first actually steer in the opposite direction . Check this
02:45	out . I'm about to make a sharp left turn
02:48	, so what I want to do is I first
02:50	briefly steered to the right . This makes it so
02:52	I start leaning to the left . Once I'm sufficiently
02:55	leaning to the left , I can finally complete the
02:57	term you would say if you want to make a
02:59	left turn first here the right , but this secret
03:02	is crucial to balance . In fact , I even
03:05	counter steer when writing backwards , Let's check out counter
03:08	staying with a great trick that all units like I
03:10	should learn , bunny hops , bunny up to when
03:13	you stop pedaling forwards and you start bouncing up and
03:15	down . Kind of like a pogo stick . You
03:17	have to move the blood of contact underneath you for
03:19	each time you land . Well let's say you want
03:22	to hop to the right first , then slightly to
03:24	the left and then push off to go bounding away
03:26	and if you really want impression friends try the bunny
03:29	hops on the wheel . Same concept , move the
03:31	point of contact in the opposite direction so you can
03:33	move the way you want to go . What if
03:35	you want to stay in the same place on the
03:36	unit cycle ? You want to do the trick called
03:38	idling Ireland is rocking back and forth with the wheel
03:41	so you almost stay in one place item is really
03:43	like counter staring because it's all about moving the point
03:46	of contact with the ground . So what does all
03:48	this mean to just simply ride at Una cycle ?
03:51	You have to move the point of conduct underneath you
03:53	left and right and forwards and backwards before you go
03:56	. Units . I going away , I want to
03:58	say always wear a helmet . How much increase the
04:00	time it takes for a collision between you and the
04:02	ground . More time for a collision means the last
04:06	force and less force equals happier . You know ,
04:08	cyclist you will fall if you dry unit psyching ,
04:11	guaranteed . The trick is to artfully dismount , be
04:15	smart , be safe and just keep pedaling . Oh
04:20	, nothing close to cara .

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