Bill Nye the Science Guy episodes 100 Motion

A young man makes a projectile of himself

this time from the mouth of a cannon

a man fired through the air

the universal laws of motion

Bill Nye the Science Guy

[ Bill Nye the Science Guy theme ]

Science Rules

Bill Nye the Science Guy

Bought to you buy Pushy People

when you need something moving

call Pushy People

Everything in the universe including

you and me is in motion

now forces put things in motion

Forces like when something is

pushed or pulled

To understand motion you have to figure out

if you are pushing on things or if things are pushing on you

Let me show you what I mean

We are right here

but we were over there

um over there

here

After I come through the door

it looked like I was walking through the lab

in a sense I was , but I was on a platform

and I was standing over pretty much

the same part of the main lab the whole time

Till I fell off the platform

You couldn't seperate the motions

Now watch them both one more time

Everything in the universe including you and me

is in motion

Forces put things in motion

Forces like when something is pushed or pulled

To understand motion you have to figure out if

you are pushing on things or if things are pushing on you

take a look at this

This is an air track

when the pump is running air comes out of these

little holes

and it can support the weight of a scooter like this

Now when I place the scooter on the track

and let go it just sits there

it doesn't move unless

I give it a push and it keeps moving unless I give

it another push

or it hits the end of the track

or maybe another scooter

another scooter, another scooter

Now here's the thing if we had enough track and

enough air

The scooters would keep scooting forever there would be

nothing to slow them down

Well hardly anything

So when something is at rest or sitting still

it stays sitting still , unless acted on by an outside force

If something is moving it keeps moving unless

acted on by an outside force

outside force , outside force ,

This is true of everything that you can touch and

see as you may know

Inertia is a property for matter

Inertia is a property of matter

A bowling ball weights more than a golf ball

right now their weights are supported by these wires

but if i push them or make them

run into each other

you can tell that the bigger one is harder to move

We call this property of matter Inertia

Inertia is a property of matter

This is an anvil , it has a lot of Inertia

now it's being acted on by an outside force

Gravity

But it's also being acted on by another outside force

the pull of the chain

Now to get an idea of just how much Inertia

it has, we will lower it

What's that noise.. Whoa Whoa

Whoa Whoa Whoa

Inertia , Whoa

Now just for kicks , this is another type of air bearing

the pump is on here

Now gravity is still pulling it down

and the air pressure is holding it up

so those forces are in balance

but the anvil has a lot of inertia

and to get it moving we need a big push

Oh no not this again , come on Bill please no !!!

Whats Inertia , I'll show you

Take a playing card and set it over a glass

Set a quarter on top of the playing card

Flick the card hard with your finger like this

The card goes flying but the quarter falls into the glass

The quarter has inertia

it's not moving so it stays at rest

but the card slide out so easily

It doesn't overcome the quarters inertia

so the quarter stays put

of course once the card is gone there is nothing left

holding the quarter so it falls into the glass

whether something is moving or sitting still

everythings got inertia

Okay we got everything packed away

Let's get'em on the truck

Here boxes ,boxes, boxes

[ whistles at boxes ]

here boxes , come on

I think you gotta get tough with 'em

Hey boxes ! Hey . Get on the truck

Hey why don't ya try a little psychology

Hey , I hear they're giving out free ice cream

to the first twenty boxes that get on the truck

Hey , says here that nothing gets

moved unless they get pushed or pulled

Great ! Thats means we'll have to do the work

Just like last time

Please come on , boxes you're so heavy

Come on on the truck , just out the door

Newtons Laws of Motion

First Law : The Law of Inertia

Things at rest , stay at rest

Hi Bill , I'm at rest

Things in motion stay in motion

Wee , I'm in motion

Unless acted on by an outside force

Second Law : To move a mass you need a force

Here's a mass

and here's a force

and then in mathematics we say

Force = mass x acceleration

F= ma

So in order to get the same mass

accelerating twice as fast you need twice as much force

Here's the mass and here's twice as much force

The Third Law: For every action there is an equal

and opposite reaction

Action , Reaction

Equal and Opposite , Action and Reaction

Two masses , this one's going to be moving

action , reaction

One car moving , against two cars

They move off half as fast

Thats the equal and opposite reaction

Newtons Laws of Motion

Tonights episode , The First Law

An object at rest remains at rest unless acted upon

by an outside force

An object in motion tends to stay in motion

Unless acted upon by and outside force

Let's watch that again in slow motion

Without motion you're just a potato on the couch

Street Luging is a highly modified

version of skateboarding or butt boarding

Get these babies in motion and there is no stopping it

Let's do it , It's on

We pushing along the ground to get us started

and then we are under the wheel of gravity

and the grade of the hill to determine our maximum velocity

and our speed

What we got here are weights ,our shoes and our life line

That's after one run down a fifty mile and hour hill

so got about two or three more runs outta those

then get a new pair

To have motion takes motion , you either got to push or pull

Join the inertia dance project for

a very special evening of movement and motion

choreographer Isaac Newton sends his world

premier piece entitled Bodies at Rest

Stay at Rest

mimes not admitted unless accompanied by a speaking person

This apple has inertia

it has mass right now the scale is measuring the

pull of the earths gravity

on the apples mass

Here in the plane we have a lot of motion

but the scale reads just about the same

because the apple still has the same mass

Now as we go down the apple is falling at the same

speed as gravity makes it fall

we are weightless , the scale reads zero

but the apple is still the apple it still has inertia

but now as we pull up the scale reads higher

the plane is pulling you , me and the apple up against the pull of gravity

we measure mass in grams or kilograms

so if i do this the apple might be weightless but

it wouldn't be massless

Space-tone news presents ; the place space

The question , In zero gravity do the laws of motion

still apply. The answer yes

objects in motion in space tend to stay in motion

unless something slows them down

Move ! Why won't you move

Go back to where you belong

Use the force

Huh ?

Use force

an object at rest will stay at rest

until an outside force acts upon

use force Luke

It worked

So what did you learn in school son

Nothing

Son

Okay , I'll show you

See we learnt that objects at rest stay at rest unless

of course they're pushed or pulled

but this cloth because I jerked it so quickly

couldn't push or pull any of the objects on the table

By the way nice choice of cereal mum

That's my boy

Hey , it's lunch time

oh okay… stay right here , don't move

Sure is quiet

Yeap

Nothing moving for miles around

Nope

Pa

Yeah

There is something I gotta tell ya pa

What is it Delilah

That last statement you made isn't entirely accurate

although to you the observer it appears that

nothing is moving , well that is merely an

artefact of your frame of reference

Like right now the earth , it's spinning

on its axis at about one thousand six hundred kilometres an hour

and the earth is moving around that sun about

thirty kilometres a second , plus our entire solar

system here it's just hurtling around the outer edges

of the Milky Way galaxy at one hundred and twenty

kilometres per second

not the mention the moment of our galaxy within the universe

it's expanding at speeds approaching the speed of light

that's about three hundred thousand kilometres per second

So you see pa , we're all us here moving

perrty fast

[singing ] " We're all in motion

We're all in motion

Everything in the universe

is all in motion

When things are pushed or pulled

They're put in motion

The more the mass

The more force we need

The more inertia the

the more force we need

We're all in motion

That's what it seems

[ fast rock music plays ] I'm Bill Nye

We're all in motion

We're all in motion

everything in the universe is all in motion

When things are pushed or pulled they're put in motion

The more the mass

The more force you need

The more inertia

the more force you need

We're all in motion

That's what it seems

[ slow music again ] We're all in motion

We're all in motion

Well that's our show thanks for watching

If you'll excuse me I've got some third derivative jerk functions to evaluate

See Ya

ooo arrgghh never get used to it

The dummy is no longer in motion

produced in association with the National Science Foundation

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