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AP Physics 1: 2.4 Object Interaction and Forces 245 Views


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AP Physics: Object Interaction and Forces Drill 2, Problem 4. What is the tension of the string as the baskets move?

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Transcript

00:00

All right And here's your shmoop douceur brought to you

00:04

by tensions were talking about tension and physics Not about

00:08

attention Watching your team playing game seven world series like

00:12

have our fingernails seen better days Check the following diagram

00:15

and passage right here you rocks lunch All right Your

00:19

tree house has sweet system for bringing up food without

00:21

making you descend your ladder A string connects two baskets

00:24

over a massless pulley basket A resting ground level in

00:27

basket b is at your front patio Yes You have

00:30

a patio it's that suite when your mom comes by

00:32

and puts luncheon lower basket you add rocks the basket

00:35

b in order to live basket eh With heavier basket

00:38

falls in lighter taste Your basket rises and voila Lunch

00:41

is served Assume that the police frictionless that basket has

00:45

a mass of two kilograms And basket b has a

00:47

total mass of six kilograms Question What is the tension

00:52

of the string as the baskets move All right i'll

00:56

answer All right well just quick Heads up the answer

01:00

this questions you're going to need to have answered the

01:03

previous question first it's okay we'll wait You can't help

01:07

But look for only back then Question three were so

01:09

much younger than so vibrant But if today is just

01:12

a random question work they don't worry about it One

01:14

extra question won't hurt at least All right Now in

01:19

order to calculate the force of tension on the string

01:22

we need to take the product of one of the

01:23

objects mass times gravity and added to the product of

01:26

the objects mass times acceleration So if we use our

01:30

lunches object one equation looks like this All right Because

01:36

we already calculated the acceleration in the last question We

01:38

have all the numbers we need to answer this one

01:40

See your previous question Come in handy now Let's Plug

01:44

in the numbers two kilograms times ten meters per second

01:47

squared plus two kilograms times five meters per second squared

01:51

It gives us thirty newtons Which means the correct answer

01:53

is option deep But just to be sure let's plug

01:56

in the numbers using basket be we might initially think

01:59

that we come up with a different answer because basket

02:01

b has a larger mass But remember basket b is

02:04

moving away from us so it has negative acceleration Numbers

02:09

would look like this 6 kilograms times ten meters per

02:12

second squared plus six kilograms times negative five meters per

02:16

second Squared equals thirty newtons about that what's the same

02:21

No matter which object we use As long as we

02:23

remember to use positive acceleration for an object moving towards

02:26

us and negative acceleration for an object moving away from

02:30

us If we study enough hopefully we can reduce the

02:32

tension felt while waiting for ap physics test results Because

02:36

our fingernails Well they just can't take it anymore I've 00:02:39.61 --> [endTime] been down to the bone

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