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Object Interaction and Forces Videos 13 videos
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.
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.
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...
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.
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
Full Transcript
- 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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