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AP Physics 1: 1.2 System Interactions and Changes 250 Views


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AP Physics 1: 1.2 System Interactions and Changes. What is the total mechanical energy of the system?

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Transcript

00:00

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

00:05

brought to you by toy cars when we were little

00:07

We used to love playing with toy cars but our

00:10

insurance premiums only just went through the roof Atticus is

00:14

playing with his new hot wheels set He assembles a

00:17

ramp That's two leaders tallinn places a six kilogram car

00:21

at the top of the ramp Six kilograms You kidding

00:23

me Hot wheels with cold way that's very heavy hot

00:27

wheels car way don't write this way The car reaches

00:31

the speed of five meters per second at the instant

00:33

it crosses the halfway point of the ram What is

00:36

the total mechanical energy of the system And hear the

00:40

potential answers like fifteen pound car His cards were ounces

00:46

all right mechanical energy doesn't mean we're excited because we're

00:50

doing the robot like that Although we do have some

00:52

pretty sweet robotic dance moves but separate issue no mechanical

00:56

injury is the sum of potential energy plus kinetic energy

01:00

let's tackle potential energy first potential energy equals mass times

01:03

gravity times height In this scenario the highest two meters

01:07

gravity is always his ten meters per second squared and

01:09

the car has a massive six freaking kilograms That's very

01:13

big waken Plug the numbers into the equation to get

01:16

the potential energy which comes to one hundred twenty jules

01:19

now kinetic energy equals one half of mass times the

01:22

square of velocity Got it all right now are kinetic

01:25

energy here equals one half of six kilograms times the

01:29

square of five meters per second giving us a kinetic

01:33

energy of seventy five jewels on lookout We did the

01:36

math All right Well that does it for the heavy

01:38

lifting Now we just add the two numbers together to

01:41

get the total mechanical energy that seventy five jewels lost

01:45

One hundred twenty Jules gives us a total mechanical energy

01:48

of one hundred ninety five jewels Option d is the

01:51

correct answer As long as we can remember the equations

01:54

the math and physics is pretty easy We like to

01:57

think of the equations like the owner's manual of the

01:59

car before we started road trip We have to know

02:01

how to start the car Justice seats open the gas

02:04

tank You know that kind of stuff Actual equation is

02:07

like the directions for our trip But if we don't

02:09

know how to operate the vehicle We'll never get their

02:11

way Just need to remember that when it comes to

02:13

driving safety first but be a boring way to play

02:17

hot wheels Go back through the roof there that's Really 00:02:20.13 --> [endTime] cool

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