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System Interactions and Changes Videos 15 videos

AP Physics 1: 1.1 System Interactions and Changes
196 Views

We wouldn't give away the answer to this AP Physics question, not for all the joules in the crown. Come back when you've got some actual jewels. Th...

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

AP Physics 1: 1.4 System Interactions and Changes
172 Views

AP Physics 1: 1.4 System Interactions and Changes. What is the change in linear momentum?

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AP Physics 1: 1.1 System Interactions and Changes 196 Views


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Description:

We wouldn't give away the answer to this AP Physics question, not for all the joules in the crown. Come back when you've got some actual jewels. Then we'll talk. 

Language:
English Language

Transcript

00:00

Thank you We sneak and here's your shmoop du jour

00:05

Brought to you by jules as in units of work

00:08

not as in diamonds and rubies No i checked the

00:10

falling diagram This thing here all right A two kilogram

00:13

boxes lifted to a height of ten meters through the

00:16

path indicated by the arrow What is the total work

00:20

done on the box and hear the potential answers money

00:23

jewels Well before we get started it's important to recognize

00:27

that we're dealing in physics math here not in real

00:29

world situations In math terms If we carry a piano

00:32

up two flights of stairs and then back down again

00:35

no work has been done on the piano After all

00:37

it hasn't had any net movement and the force has

00:40

been applied to it has been negated We'll work mathematically

00:45

speaking equals force times Displacement and displacement which is represented

00:50

by x means a total change in position of an

00:54

object Well in our question we think in terms of

00:57

direction the boxes moved four meters to the west Five

01:01

meters to the north four meters to the east and

01:05

another five meters north The four meters east and west

01:09

Cancel each other out there's No displacement there because in

01:12

terms of lateral movement we end up where we started

01:16

so our total displacement is ten meters Now to determine

01:20

the force use we use our trusty equation force equals

01:23

mass times acceleration because the box is being moved up

01:27

The acceleration comes from gravity which is about ten meters

01:30

per second squared and since we know the mass of

01:33

the boxes two kilograms we can calculate the force Let's

01:37

go ahead and plug our numbers into the work equation

01:40

Here Work equals twenty newton's times ten meters for a

01:43

total of two hundred jewels So option b is the

01:46

correct answer Remember no matter how hard we work while

01:49

studying in physics terms There's No work being done if 00:01:52.85 --> [endTime] we just stay at our desk

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