00:01Again, man makes a projectile himself, this time from the mouth of a cat.
00:07A man fired in the air, owes humankind in action, the universal laws of motion!
00:21Build by the science guy, build by the science guy, build, build, build, build, build, build,
00:29Build by the science guy, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build,
00:45build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build,
00:50build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build,
00:52build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build,
00:52build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build, build,
00:55build, build, build, build, build, build, build, build, build, build, build, build, build, build
00:58moving call pushy people everything in the universe including you and me is in motion
01:07now forces put things in motion forces like when something is pushed or pulled
01:15to understand motion you have to figure out if you're pushing on things or things are pushing
01:24on you whoa let me show you what i mean we are right here uh right here but we were
01:34over there um over
01:36there here after i came through the door it looked like i was walking through the lab and in a
01:52sense
01:52i was but i was on a platform and i was standing over pretty much the same part of the
01:58main lab
01:59the whole time until i fell off the platform
02:02you couldn't separate the motions now watch them both one more time everything in the universe
02:13including you and me is in motion now forces put things in motion forces like when something is
02:23pushed or pulled to understand motion you have to figure out if you're pushing on things or things
02:33are pushing on you take a look at this
02:42this is an air track when the pump's running air comes out of these little holes
02:49and it can support the weight of a scooter like this one now when i place the scooter on the
02:55track and
02:56let go of it it just sits there it doesn't move unless i give it a push then it keeps
03:03moving unless
03:03i give it another push or it hits the end of the track or maybe another scooter another scooter another
03:11scooter now here's the thing if we had enough track and enough air the scooters would keep scooting
03:16forever there'd be nothing to slow them down well hardly anything so when something's at rest or sitting
03:21still it stays sitting still unless acted on by an outside force and when something's moving it keeps
03:27moving unless acted on by an outside force outside force outside force this is true of everything that
03:37you can touch and see as you may know inertia is a property of matter inertia is a property of
03:43matter
03:45a bowling ball weighs more than a golf ball right now their weights are supported
03:51by these wires but if i push them or make them run into each other you can tell that the
03:58bigger
03:58one is harder to move we call this property of matter inertia inertia is a property of matter
04:13this is an anvil it has a lot of inertia and right now it's being acted on by an outside
04:19force
04:23gravity but it's also being acted on by another outside force the pull of the chain
04:31now to get an idea of just how much inertia it has we'll lower it
04:39what's that noise
04:41Whoa! Whoa! Whoa! Whoa! Whoa! Whoa! Whoa! Whoa! Whoa!
04:51Inertia! Whoa!
05:05Now, just for kicks, this is another type of air bearing.
05:10The pump's on here.
05:23Now, gravity is still pulling it down.
05:27And the air pressure is holding it up.
05:29So those forces are in balance.
05:32But the handle has a lot of inertia.
05:34And to get it moving, we need a big push!
05:37Oh, no. Oh, no. Not this again. No.
05:39Oh, come on, Bill. Please, no!
05:45What's inertia? I'll show you.
05:49Take a playing card and set it over a glass.
05:53Set a quarter on top of the playing card.
05:55Flick the card hard with your finger like this.
05:58The card goes flying, but the quarter falls into the glass.
06:08The quarter has inertia.
06:10It's not moving, so it stays at rest.
06:12The card slides out so easily.
06:18It doesn't overcome the quarter's inertia, so the quarter stays put.
06:23Of course, once the card's gone, there's nothing left holding up the quarter, so it falls into the glass.
06:30Whether something's moving or sitting still, everything's got inertia.
06:45Okay.
06:46We got everything packed away.
06:50Let's get them to get on the truck.
06:53Here, boxes, boxes, boxes!
06:56Here, boxes! Come on!
07:02Where are you behind the corner?
07:02I think you got to get tough with them.
07:05Hey, boxes!
07:06Hey!
07:07Get on the truck!
07:15Hey, why don't you try a little psychology?
07:20Hey!
07:21I hear they're giving out free ice cream
07:23to the first 20 boxes to get on the truck.
07:29Hey.
07:31Says here that nothing gets moved
07:34unless they get pushed or pulled.
07:38Great.
07:38That means we'll have to do the work.
07:41Just like last time.
07:46Please.
07:47Come on, boxes.
07:48You're so angry.
07:49Right on you.
07:51Just out of the door.
07:53Newton's laws of motion.
07:55First law, the law of inertia.
07:58Things at rest, stay at rest.
08:03Hi, Bill.
08:05I'm at rest.
08:08Things in motion, stay in motion.
08:13We got the push-up!
08:24Unless acted on by an outside force.
08:27Second law.
08:29To move a mass, you need a force.
08:34Here's a mass.
08:35Hey.
08:36And here's a force.
08:38It's hard to maintain this position, you know.
08:50And then in mathematics, we say force equals mass times acceleration.
08:56F equals M-A.
08:58So in order to get the same mass accelerating twice as much, you need twice as much force.
09:05Here's the mass.
09:06And here is twice as much force.
09:09Yeah, for sure.
09:22The third law.
09:24For every action, there is an equal and opposite reaction.
09:28Action, reaction.
09:29Equal and opposite action, reaction.
09:35Here we go again.
09:38Two masses.
09:39This one's going to be moving.
09:40Woo!
09:41Action, reaction.
09:44Whoa, whoa, whoa.
09:50One car moving against two cars.
09:53Woo!
09:54They move off half as fast.
09:56That's the equal and opposite reaction.
10:00Newton's laws.
10:02Of motion.
10:04What do you think of that?
10:07Life is like a boxcar of inertia.
10:12And now, Newton's laws of motion.
10:16Tonight's episode, The First Law.
10:21An object at rest remains at rest unless acted upon by an outside force.
10:28An object in motion tends to stay in motion unless acted upon by an outside force.
10:44Let's watch that again in slow motion.
10:59Without motion, you're just a potato on the couch.
11:13Street luging is a highly modified version of skateboarding or butt boarding.
11:19You get these babies in motion and there's no stopping it.
11:23Let's do it.
11:25Come on, man.
11:25It's on.
11:26It's on.
11:30We push along the ground to get us started, and then we're under the will of gravity and
11:35the percentage grade of the hill to determine our maximum velocity and our speed.
11:50What we got here are our brakes, our shoes, and our lifeline.
12:01Well, that's after one run down about a 50-mile-an-hour hill, so I've got about two or three
12:06more runs
12:07out of those, and I'll have to grab in for a new pair.
12:09To have motion, it takes motion.
12:12You either got to push or pull.
12:32Join the Inertia Dance Project for a very special evening of movement and motion.
12:38Choreographer Isaac Newton presents his world premiere piece entitled,
12:43Bodies at Rest, Stay at Rest.
12:48Mind's not admitted unless accompanied by a speaking person.
12:53This apple has inertia.
12:55It has mass.
12:57Right now, the scale is measuring the pull of the Earth's gravity on the apple's mass.
13:09Here in the plane, we have a lot of motion, but the scale reads just about the same because
13:16the apple still has the same mass.
13:20It goes over.
13:25Now, as we go down, the apple is falling at the same speed as gravity makes it fall.
13:32We're weightless.
13:33The scale reads zero, but the apple's still the apple.
13:38It still has inertia.
13:41But now, as we pull up, the scale reads higher because the plane is pulling you, me, and the
13:47the apple up against the pull of gravity.
13:55We measure mass in grams or kilograms.
13:59So if I do this, the apple might be weightless, but it wouldn't be massless.
14:05Space Tone News presents the place, space.
14:10The question, in zero gravity, do the laws of motion still apply?
14:15The answer, yes.
14:17Objects in motion in space tend to stay in motion unless something slows them down.
14:31Move.
14:33Move.
14:33Why won't you move?
14:35Go back to where you belong.
14:37Use force.
14:38Huh?
14:40Use force.
14:42An object at rest will stay at rest until an outside force acts upon it.
14:48Use force, Luke.
14:50Huh.
14:55It worked.
15:02So, what'd you learn in school, son?
15:06Nothing.
15:10Son.
15:12Okay.
15:14I'll show you.
15:23See, we learned that objects at rest stay at rest unless, of course, they're pushed or
15:28pulled.
15:28But this cloth, because I jerked it so quickly, couldn't push or pull any of the objects on
15:33the table.
15:37By the way, nice choice of cereal, Mom.
15:43That's my boy.
16:01Hey, it's lunchtime.
16:03Oh, okay.
16:05Hey, stay right here.
16:06Don't move.
16:17Sure is quiet.
16:21Yep.
16:25Nothing moving for miles around.
16:30Nope.
16:33Pa?
16:35Yep.
16:37There's something I gotta tell you, Pa.
16:44What is it, Delilah?
16:47Well, that last statement you made isn't entirely accurate.
16:50Although, to you, the observer, it appears that nothing is moving.
16:56Well, that is merely an artifact of your frame of reference.
17:00Like, right now, the Earth, it's spinning on its axis at about 1,600 kilometers per hour.
17:08And the Earth is moving around that sun about 30 kilometers per second.
17:13Plus, our entire solar system here.
17:16Why, it is just herpling around the outer edges of the Milky Way galaxy at about 220 kilometers
17:22per second.
17:23Not to mention the movement of our galaxy within the universe.
17:27It's expanding.
17:29It's speeds approaching the speed of light.
17:31That's about over 300,000 kilometers per second.
17:37So, you see, Pa?
17:39We're all us here moving pretty fast.
17:57We're all in motion.
18:03We're all in motion.
18:10Everything in the universe is all in motion.
18:18Everything in the universe is all in motion.
18:23When things are pushed up old, they're put in motion.
18:34The more the more the more the more the more force we need.
18:46The more inertia, the more force we need
18:59We're all in motion, that's what it seems
19:15I'm Bill Nott
19:43We're all in motion, we're all in motion
19:50Everything in the universe is all in motion
19:57When things are pushed or pulled, they're put in motion
20:04The more the mass, the more force we need
20:10The more inertia, the more force we need
20:19We're all in motion
20:22Just like that
20:23That's what it seems
20:47We're all in motion
20:53We're all in motion
21:14Well, that's our show
21:15Thanks for watching
21:34If you'll excuse me
21:35I've got some third derivative jerk functions to evaluate
21:41See ya
21:50I never get used to it
21:52The dummy is no longer in motion
21:54The dummy is no longer in motion
21:57Produced in association with the National Science Foundation
22:01I love science
22:05Science
22:06Yeah
22:08Man, this is a ways down
22:10Okay, here we go
22:12Science
22:18Oh, man
22:20Science
22:24Science
22:25Science
22:30Science
22:31Science
22:31It's science
22:32Science
22:34Science
22:36Science
23:01Just like this
23:04Oh, my God!
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