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System Interactions and Changes Videos 15 videos

AP Physics 1: 1.1 System Interactions and Changes
196 Views

We wouldn't give away the answer to this AP Physics question, not for all the joules in the crown. Come back when you've got some actual jewels. Th...

AP Physics 1: 1.2 System Interactions and Changes
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AP Physics 1: 1.2 System Interactions and Changes. What is the total mechanical energy of the system?

AP Physics 1: 1.4 System Interactions and Changes
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AP Physics 1: 1.4 System Interactions and Changes. What is the change in linear momentum?

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AP Physics 1: 1.5 System Interactions and Changes 241 Views


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AP Physics 1: 1.5 System Interactions and Changes. How much energy is expended in one lap?

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English Language

Transcript

00:00

Thank you We sneak and here's your smoke du jour

00:05

Brought to you by exercise You can go to the

00:07

gym to work out your body but you're here to

00:10

work out your mind All right Pushing a ten kilogram

00:13

block around a circular track is tiring you know although

00:16

the block it's nothing out of the experience At least

00:19

you logged your workout for the week or a month

00:21

If the track has a radius of one hundred meters

00:24

and the block track surface has a kinetic coefficient of

00:28

friction of zero point to how much energy did you

00:32

expend in one lap and hear the pencil answers All

00:36

this funky letter writing Well first of all we have

00:39

to find a new personal trainer pushing a wooden block

00:42

around a track isn't gonna get us ready for beach

00:44

season That's what we get for hiring a physicist to

00:46

get us in shape huh Well to complete the calculation

00:49

here we need to employ the work energy the're Um

00:52

which defines the relationship between work and energy Yeah Wow

00:56

that was a shock That wasn't it Now work equals

00:58

force times distance And in our case here the force

01:01

we're looking at is the force of friction The force

01:04

of kinetic friction equals the coefficient of friction times mass

01:07

times gravity to determine the work done we just need

01:10

to add distance to the equation Since we're going in

01:13

a circle we need to know the circumference to calculate

01:16

the distance traveled We know that the radius of the

01:19

circle is a hundred meters so we just double it

01:21

Multiply that by pi to get the circumference Remember the

01:24

formula empire Okay Lookit our potential answers We can see

01:29

that pie is included in the final results so we

01:32

don't have to actually figure out the exact number We

01:35

can just stick with two hundred pie now Let's Plug

01:38

in the Numbers work equals point 2 times ten kilograms

01:43

times nine point eight meters per second squared times two

01:46

hundred py meters Which gives us an answer of three

01:49

thousand nine hundred twenty pie Jules well if we convert

01:53

jewels to kill a jules will get an answer of

01:56

three point nine Two pi killa jewels So option a

01:58

is the correct answer Now on to the next question

02:01

If we only go to the gym three times a

02:03

month How much are we really paying for our monthly 00:02:06.5 --> [endTime] membership No

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