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System Interactions and Changes Videos 14 videos
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. What is the total mechanical energy of the system?
AP Physics 1: 1.4 System Interactions and Changes. What is the change in linear momentum?
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.
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
Full Transcript
- 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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