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AP Physics 1: 3.3 Changes and Conservation Laws 192 Views


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AP Physics 1: 3.3 Changes and Conservation Laws. What is the difference in work done?

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Transcript

00:00

Thank you We sneak And here's your smoke do as

00:05

you are brought to you by horses Horses are beautiful

00:08

majestic creatures And we make them carry us around it's

00:11

Kind of like if we made george clooney give us

00:13

a piggy back ride All right a printing press has

00:16

two options for moving books A distance of forty meters

00:20

The first option is a conveyor belt that runs for

00:22

one hour on a single motor that provides a constant

00:25

power of seventy five watts age a day The second

00:29

option is a horse that pulls boxes of books with

00:31

a constant force of one kilo newt by making ten

00:36

one way trips The horse khun transport the same number

00:39

of books is the conveyor belt In a single day

00:42

the motor gets the job done in an hour by

00:44

doing less work than the horse does in a day

00:47

Well what's the difference in work done and here the

00:49

pendulum killed Well boy we're dealing with some pretty ancient

00:55

technology here Conveyor belts horse drawn wagons and books All

01:00

right that's ok physics is timeless We've got this We

01:03

know that work equals force times displacement but power in

01:06

physics terms is work Divided by time we can rearrange

01:11

that equation to find that work equals power times times

01:14

that w p t we know that the conveyor belt

01:17

motor runs for an hour and produces seventy five watts

01:20

will use seconds as our unit of time And there

01:23

are thirty six hundred seconds in an hour We'll when

01:26

we plug in the numbers we see that the power

01:28

produced by the conveyor belt is two hundred seventy Killer

01:32

jules seven five three Now to figure out the work

01:36

done by mr ed Remember him cold Ask your parents

01:40

All right The horse produces a thousand newton's of force

01:42

over the forty meter distance So the work done by

01:45

the horse equals forty Kill a jewel But the horse

01:49

makes this trip ten times So the total work done

01:52

by the horse is for hundred killer jules Now we

01:56

could just find a difference between the two So the

01:58

correct answer is b if we ever have a horse

02:02

when we better take good care of it and give

02:04

it a character too is a tree Mr ed would

02:06

be grumpy without character Well you know same thing goes 00:02:09.22 --> [endTime] for george but that's A different story

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