# AP Physics 1: 2.4 Object Interaction and Forces

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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?

AP Physics 1 | Object Interaction and Forces |

Language | English Language |

Science Practice 6 | Working with scientific explanations and theories |

### Transcript

tree house has sweet system for bringing up food without

making you descend your ladder A string connects two baskets

over a massless pulley basket A resting ground level in

basket b is at your front patio Yes You have

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

and puts luncheon lower basket you add rocks the basket

b in order to live basket eh With heavier basket

falls in lighter taste Your basket rises and voila Lunch

is served Assume that the police frictionless that basket has

a mass of two kilograms And basket b has a

total mass of six kilograms Question What is the tension

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

answer All right well just quick Heads up the answer

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

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

But look for only back then Question three were so

much younger than so vibrant But if today is just

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

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

order to calculate the force of tension on the string

we need to take the product of one of the

objects mass times gravity and added to the product of

the objects mass times acceleration So if we use our

lunches object one equation looks like this All right Because

we already calculated the acceleration in the last question We

have all the numbers we need to answer this one

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

in the numbers two kilograms times ten meters per second

squared plus two kilograms times five meters per second squared

It gives us thirty newtons Which means the correct answer

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

in the numbers using basket be we might initially think

that we come up with a different answer because basket

b has a larger mass But remember basket b is

moving away from us so it has negative acceleration Numbers

would look like this 6 kilograms times ten meters per

second squared plus six kilograms times negative five meters per

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

No matter which object we use As long as we

remember to use positive acceleration for an object moving towards

us and negative acceleration for an object moving away from

us If we study enough hopefully we can reduce the

tension felt while waiting for ap physics test results Because

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