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AP Physics 1 Videos 86 videos

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AP Physics 1: 1.1 Changes and Conservation Laws 385 Views


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AP Physics 1: 1.1 Changes and Conservation Laws. What is the speed of the other piece of wood?

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Transcript

00:00

Thank you We sneak And here's your shmoop dooz your

00:05

brought to you by wooden blocks Some kids like to

00:08

build bridges or houses with him We tried to build

00:11

particle colliders Well physics was always in our blood All

00:14

right a ten kilogram wooden block explodes and splits into

00:17

two equally sized pieces that fly apart in opposite directions

00:21

One piece has a speed of three meters per second

00:24

what's the speed of the other And here the pendulum

00:27

answers to three six All right well luckily when we

00:31

were playing with wooden blocks they didn't spontaneously explode That

00:35

might have been pretty fun known Kind of cool to

00:36

watch All right now since we're dealing with two objects

00:40

moving in different directions one velocity will be positive and

00:43

the other will be negative They each start out it

00:46

zero since they're not moving And because these objects are

00:49

of equal mass and because their movement starts because of

00:53

the same force their momenta cancel each other out if

00:57

we adam together But we still get zero just like

01:00

how they started So let's get to the math We

01:02

have the two momenta which will label and wanted him

01:05

to linear momentum equals mass times velocity right Since the

01:10

total mo mentum equals zero we can subtract one moment

01:13

Um from the other two Get zero and then we

01:16

can plug in our numbers since the block split evenly

01:19

into the mass for each block is five kilograms and

01:22

we know one half's velocity is three meters a second

01:25

But when we do the math we see that the

01:27

other half's velocity is also three meters per second making

01:30

option b the right answer Now we did some math

01:32

to get there but we could have gotten the same

01:34

answer by just thinking about our old friend ike Yeah

01:38

Isaac newton Powdered wig in ala He's still the man

01:41

newton's third law states that for every action there is

01:44

an equal and opposite reaction Right We had a tattoo

01:48

Well that's what we put on our body So in

01:51

this explosion since one half takes off at three meters

01:54

per second wonder action the other piece has to do

01:57

the same just in the opposite direction But even if

01:59

we were to choose be right off the bat It's

02:01

Always good to know how the math works so we

02:03

can prove just how Smart We are right Sheldon bazinga

02:08

We were never able to prove our young genius with

02:10

blocks It turns out that it's pretty difficult to make

02:12

a particle collider with him but no worries though We 00:02:15.385 --> [endTime] still made sure there was a collision Sorry mom

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