# AP Physics 2: 1.2 Object Interaction and Forces

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

AP Physics 2 | Object Interaction and Forces |

Language | English Language |

Science Practice 6 | Working with scientific explanations and theories |

### Transcript

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

there such a stephen gray used it as a form

of entertainment In seventeen thirty gray invented the flying boy

experiment to show that the human body could conduct electricity

In the experiment a boy was suspended from the ceiling

by silk chords and his feet were attached to a

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

moved up to his hands Boy could now attract feathers

or small slips of paper to his fingers and check

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

how they dressed back then it treats the boy and

a feather as point charge is separated by two centimeters

The boy has a charge of one micro coolum and

the feather has a charge of four nano columns and

a massive ten to the negative forthe kilograms use columns

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

the feather and hear the potential answers All right Okay

Well when we were younger science class might have been

a little more interesting and a lot more frightening if

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

through us apparently using small children as guinea pigs was

cool back in the seventeen hundreds were kind of glad

things are different now to solve this first we need

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

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

cool ums Law states and an electric force between two

objects equals the product of cool arms constant and the

two charges use of one and use up to divided

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

equation All right In this case que ce of one

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

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

top We have cool ums constant which will round up

to nine times ten to the ninth newton meters squared

for coolum square Then we have the charges for the

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

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

ten to the negative Nine columns All that is over

two tons ten to the negative Second meters squared You

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

Big numbers were scared of clowns heights and rabbits but

not big numbers All right when we do the math

We get a force of nine times ten to the

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

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

school than big c I would like that all right

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

law isaac newton says force equals mass times acceleration which

means that acceleration equals force divided by mass But we

just found the force nine times ten to the negative

second news and we know the mass of the feather

ten to the negative forthe kilogram Well when we plug

in the numbers we find that the acceleration has nine

times ten to the second meters per second squared or

nine hundred meters per second squared That means he is

the right answer and no matter how much our little

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