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Object Interaction and Forces Videos 13 videos

AP Physics 1: 1.1 Object Interaction and Forces
258 Views

If there's one good thing about the heat death of the universe, it's that we'll all have an excellent excuse for dodging physics homework.

AP Physics 1: 1.2 Object Interaction and Forces
213 Views

The real moral of the story here is just "don't get in the way of elephants or tigers." That is not the kind of kinetic energy you want to absorb.

AP Physics 1: 1.3 Object Interaction and Forces
236 Views

Hi there. We'd like to wave hello to you, but the internet isn't letting us. So instead, accept this fun question about waves and physics! It's alm...

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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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