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AP Physics 2 Videos 66 videos

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AP Physics 2: 1.2 Object Interaction and Forces 167 Views


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AP Physics 2: 1.2 Object Interaction and Forces. What is the acceleration experienced by the feather?

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Transcript

00:00

Thank you We sneak then here's your shmoop du jour

00:05

brought to you by experimenting with electricity which should be

00:08

done very carefully We don't want to do an experiment

00:11

that only teaches us that electricity can really hurt you

00:14

Rather take sciences word for it Alright When electricity was

00:17

first discovered it didn't have much practical use Electrician's quotes

00:22

there such a stephen gray used it as a form

00:26

of entertainment In seventeen thirty gray invented the flying boy

00:29

experiment to show that the human body could conduct electricity

00:35

In the experiment a boy was suspended from the ceiling

00:37

by silk chords and his feet were attached to a

00:40

charge generator We'll charge accumulated at the boy's feet and

00:44

moved up to his hands Boy could now attract feathers

00:48

or small slips of paper to his fingers and check

00:51

out the following diagram That's what it looks like that's

00:53

how they dressed back then it treats the boy and

00:55

a feather as point charge is separated by two centimeters

00:59

The boy has a charge of one micro coolum and

01:02

the feather has a charge of four nano columns and

01:05

a massive ten to the negative forthe kilograms use columns

01:09

Law and newton's second law determined the acceleration experienced by

01:13

the feather and hear the potential answers All right Okay

01:18

Well when we were younger science class might have been

01:20

a little more interesting and a lot more frightening if

01:23

we've been wired to the ceiling with electrical current going

01:25

through us apparently using small children as guinea pigs was

01:28

cool back in the seventeen hundreds were kind of glad

01:31

things are different now to solve this first we need

01:34

to figure out the course that's acting between the boy

01:36

and the feather will use coghlan's law for that Well

01:39

cool ums Law states and an electric force between two

01:42

objects equals the product of cool arms constant and the

01:45

two charges use of one and use up to divided

01:49

by the square of the distance between them Here's the

01:53

equation All right In this case que ce of one

01:56

will be the boy's charge and queues up two will

01:59

be the feathers chart let's Plug in the numbers on

02:02

top We have cool ums constant which will round up

02:04

to nine times ten to the ninth newton meters squared

02:08

for coolum square Then we have the charges for the

02:13

boy he's got one times ten to the negative sixth

02:16

fulham's running through him and the feather has four times

02:19

ten to the negative Nine columns All that is over

02:22

two tons ten to the negative Second meters squared You

02:26

got some big numbers here but we're not scared of

02:28

Big numbers were scared of clowns heights and rabbits but

02:32

not big numbers All right when we do the math

02:44

We get a force of nine times ten to the

02:46

negative second newt okay now for the cool um let's

02:50

move on to the next lawmaker who's even more old

02:52

school than big c I would like that all right

02:56

but figure out the acceleration will go with newton's Second

02:59

law isaac newton says force equals mass times acceleration which

03:04

means that acceleration equals force divided by mass But we

03:08

just found the force nine times ten to the negative

03:10

second news and we know the mass of the feather

03:13

ten to the negative forthe kilogram Well when we plug

03:17

in the numbers we find that the acceleration has nine

03:19

times ten to the second meters per second squared or

03:22

nine hundred meters per second squared That means he is

03:26

the right answer and no matter how much our little

03:29

brother annoys us we won't go all frankenstein on him 00:03:31.813 --> [endTime] way Want to be good scientists not mad one

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