AP Physics 1: 2.3 Object Interaction and Forces

you rocks lunch right Your tree house has a sweet

system for bringing up food without making you decent Your

ladder A string connects two baskets over a massless pulley

basket Arrests at ground level and basket b is at

your front patio Yes You have a patio It's that

sweet when your mom comes by and puts lunch in

the lower basket you at rocks to basket be in

orderto lift basket a heavier basket falls and lighter taste

Your basket rises while our lunch is served We'll assume

that the police frictionless that basket a has a massive

two kilograms and basket b has a total mass of

six kilograms How fast as basket egg and your lunch

accelerate and hear the potential answers How many meters per

second squared Whoa This sounds like it might just be

the tree house of our dreams But before we hire

movers let's think about what's going on in his police

system Gravity is pulling down word on each basket and

the tension on the ropes is pulling upward and the

acceleration upward for basket a is the same as the

acceleration downward for basket b force diagrams Great tool here

if we were growing up and look a little something

like this yeah pretty cool huh So looking at the

diagram we can see that the net force of basket

a is tension minus mass times gravity and it's also

equal to mass times acceleration Well the net force of

basket b is similar but with basket be The acceleration

is a negative number because the basket is moving away

from us The equation for basket is expressed a positive

number because lunch headed towards us is always that positive

thinking Now we can solve for acceleration You subtract the

first equation from the second and solve for x And

when we do that we find that the correct answer

is b Well pulley systems are everywhere They're used on

ships elevators especially on physics test So learn this Oh 00:02:26.066 --> [endTime] snap