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Playlist AP® Physics 1: Object Interaction and Forces 13 videos

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AP Physics 1: 1.1 Object Interaction and Forces
258 Views

If there's one good thing about the heat death of the universe, it's that we'll all have an excellent excuse for dodging physics homework.

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AP Physics 1: 1.2 Object Interaction and Forces
213 Views

The real moral of the story here is just "don't get in the way of elephants or tigers." That is not the kind of kinetic energy you want to absorb.

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AP Physics 1: 1.3 Object Interaction and Forces
236 Views

Hi there. We'd like to wave hello to you, but the internet isn't letting us. So instead, accept this fun question about waves and physics! It's alm...

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AP Physics 1: 2.3 Object Interaction and Forces 220 Views


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Description:

Ah, the age old question: how long do I have to wait to stuff my face? Grab a snack and give this question a shot. 

Language:
English Language

Transcript

00:00

Thank you We sneak and he was your shmoop du

00:05

jour Brought to you by three houses If ours had

00:08

plumbing and running water well we'd never leave Well maybe

00:11

for food Wade leave for food This dominant tree houses

00:16

are checking the following diagram and passage right here Here's

00:19

you rocks lunch right Your tree house has a sweet

00:22

system for bringing up food without making you decent Your

00:25

ladder A string connects two baskets over a massless pulley

00:30

basket Arrests at ground level and basket b is at

00:32

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

00:35

sweet when your mom comes by and puts lunch in

00:37

the lower basket you at rocks to basket be in

00:39

orderto lift basket a heavier basket falls and lighter taste

00:44

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

00:48

that the police frictionless that basket a has a massive

00:51

two kilograms and basket b has a total mass of

00:54

six kilograms How fast as basket egg and your lunch

00:58

accelerate and hear the potential answers How many meters per

01:02

second squared Whoa This sounds like it might just be

01:06

the tree house of our dreams But before we hire

01:09

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

01:11

system Gravity is pulling down word on each basket and

01:14

the tension on the ropes is pulling upward and the

01:17

acceleration upward for basket a is the same as the

01:20

acceleration downward for basket b force diagrams Great tool here

01:25

if we were growing up and look a little something

01:27

like this yeah pretty cool huh So looking at the

01:31

diagram we can see that the net force of basket

01:33

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

01:38

equal to mass times acceleration Well the net force of

01:41

basket b is similar but with basket be The acceleration

01:45

is a negative number because the basket is moving away

01:48

from us The equation for basket is expressed a positive

01:52

number because lunch headed towards us is always that positive

01:55

thinking Now we can solve for acceleration You subtract the

01:59

first equation from the second and solve for x And

02:11

when we do that we find that the correct answer

02:14

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

02:18

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

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