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AP Physics 1 Videos 69 videos

AP Physics 1: 3.3 Changes and Conservation Laws
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AP Physics 1: 3.3 Changes and Conservation Laws. What is the difference in work done?

AP Physics 1: 3.5 Changes and Conservation Laws
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AP Physics 1: 3.5 Changes and Conservation Laws. Which of the following would increase the rate at which the plate spins?

AP Physics 1: 2.4 Changes and Conservation Laws
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AP Physics 1: 2.4 Changes and Conservation Laws. Which of the following circuits should the students use?

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AP Physics 1: 2.5 Object Interaction and Forces 193 Views


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Description:

Got an AP test lurking around the corner? Good thing we brought this handy slingshot and some sweet math.

Language:
English Language

Transcript

00:02

All right here's your shmoop du jour brought to you by slingshots well the [Slingshots with rocks falling behind]

00:06

most famous slingshots probably from the story of David and Goliath and if you

00:09

are intimidated by the AP test well think of yourself as David and the AP [David holding a slingshot staring at the giant Goliath]

00:14

test as Goliath then maybe shmoop would you know be the slingshot or would shmoop

00:19

be the rock in the slingshot maybe your pencil would be the rock look this [a rock with the shmoop logo in Davids slingshot]

00:24

analogy is a working process so let's just move on a rock is launched from a

00:28

slingshot at an angle between zero and 90 degrees and lands at the same height

00:33

from which it was launched which of the following are true about the rock select

00:38

two answers and here the options [muttering]

00:43

we here at shmoop would just like to remind you that slingshots should not be aimed at

00:47

people no matter how obnoxious your little brothers being compared to a lot [Boy aiming a slingshot at his younger brother]

00:51

of the other questions we've worked through this one's pretty vague after

00:55

all we don't even know the mass of the rock or the tension on the slingshot and [A rock with mass written on and a slingshot]

00:59

we're told that the angle of launch is somewhere between 0 and 90 degrees that's a

01:03

big diff we're physicists we like specifics but it's ok we're thinking

01:08

conceptually here a big picture and one big part of the big picture is gravity [Boy looking at Earth from outer space]

01:13

well gravity is always acting on everything even when an object is moving

01:16

upward gravity is still pulling it downward so option B is one of the [Boy attempting to para-sail drops down into the water]

01:20

correct choices the acceleration of gravity is yes constant and if B is

01:25

correct that means C is incorrect gravity doesn't care about what angle

01:30

the rock is launched at gravity just does one thing it isn't picky option A [person bungee jumping]

01:35

is wrong as well in a closed system energy is conserved so all along its

01:40

flight the rock isn't losing energy the kinetic energy is only lost when the [man is struck by a rock and gives thumbs up]

01:45

rock hits the ground and the energy is absorbed by the earth which means that

01:49

option D is our other correct answer the rock has the same kinetic energy right

01:53

before it hits the ground as it does when it's launched think about it this

01:56

way the rock travels in an arc when it's launched the rock requires a certain [An arc outlining the moving rocks path]

02:00

amount of kinetic energy to reach the peak of that arc at the highest point of

02:04

the arc some of the kinetic energy has been converted to potential energy but [rock's kinetic energy converted to potential energy at the peak of the arc]

02:08

for it to fall gravity has to exert force and by the time the rock is back

02:12

to its starting elevation that potential energy is back

02:15

to its old kinetic cell as long as the rock doesn't encounter anything as its

02:19

[rock smashes into a flying bird] flies it will keep all its energy that's part of Newton's first law and it always

02:24

comes back to that old guy all right so let your physics knowledge fly from the

02:28

slingshot of your brain and conquer the scary giant that is the AP physics test [student with a slingshot on his head staring at the giant Goliath]

02:32

there we go nailed it!

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