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AP Physics 2: 2.5 Changes and Conservation Laws 3 Views


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Description:

AP Physics 2: 2.5 Changes and Conservation Laws. Which of the following will occur?

Language:
English Language

Transcript

00:03

And here's your shmoop du jour brought to you by charging, charging as

00:07

in electricity not as in maxing out credit card at the comic book store [Girl carrying a stack of comic books]

00:11

although that is a fun way to spend an afternoon all right a student places two

00:15

metal spheres next to each other so that they are tangent at one point the [Student carrying two metal spheres]

00:19

student then charges a balloon with negative charge and places it near one

00:22

of the spheres which of the following will occur select two answers and here

00:26

are the choices...... all right conduction and induction are different we already know

00:35

that since there are different words and all but well we just wanted to say it

00:38

out loud the biggest difference is that charge by conduction requires physical [Zombie chasing group of student]

00:43

contact in conduction if a negatively charged object touches a neutral object

00:48

electrons move from the negative object in parting a negative charge to the [electrons moving to a neutral object]

00:52

neutral object but also weakening the negative charge on the first one in

00:56

induction there's no physical contact so the negatively charged object doesn't

01:01

lose any electrons or any charge instead the negative charge repels negative

01:06

particles in the neutrally charged object polarizing it since the [polarised charged particle]

01:11

negatively charged balloon doesn't touch the spheres we know we're not dealing [negatively charged balloon near the two spheres]

01:15

with conduction answer A) is wrong and answer B) is right this is charged by

01:20

induction and as we just discussed charge by induction means the particles [Charges rearranging in a metal sphere]

01:25

rearrange themselves so answer C) is also correct because the particles just

01:29

rearrange themselves in the neutral spheres answer D) is incorrect there's no

01:34

change in the overall charge of the system the particles have moved around

01:38

but nothing has been added or taken away from the sphere so the net charge is the [Two spheres stood together]

01:43

same well charging by induction is almost like magic you just wave a [magician on stage with negative and positive charged box]

01:48

charged object near a neutral one and press those articles go nuts rearranging

01:52

themselves maybe for our next trick we can make that credit card bill [girl makes credit card bill disappear]

01:56

disappear before your mom finds it.

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