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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: 3.4 Properties of Objects and Systems 200 Views


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Description:

AP Physics 1: 3.4 Properties of Objects and Systems. Which object experiences the greatest acceleration?

Language:
English Language

Transcript

00:03

Here's your Shmoop du jour brought to you by gravity. It's one

00:07

of the fundamental forces of the universe and also the force that's most [Woman walking down steps falls overs]

00:10

likely to make us look silly in public.. A bowling ball, a feather and a marble are

00:16

dropped from a given height within a vacuum chamber. which of those objects

00:21

experiences the greatest acceleration? And here are the potential answers

00:26

(Mumbles)

00:28

All right, let's imagine what would actually happen

00:31

in this situation we'd probably begin climbing to the top of the Empire State [Man climbing up huge staircase]

00:36

Building and well on second thought we'd take the elevator (laughs)

00:40

Come on we're carrying a bowling ball here people. Plus it's like a bajillion flights of stairs.

00:44

Anyway at the top we'd go to the observation deck and pull the bowling

00:48

ball the marble and the feather out of the bag, we look around and make sure

00:52

there's no security around... don't forget that and then we'd give them a shove.

00:56

Now what would happen well the marble and the bowling ball would drop right away, the [Marble and bowling ball have already landed and the feather is floating down]

01:01

feather well it won't be going quite so fast. But that's not because gravity is

01:05

slower for the feather after all gravity is a constant the reason the feather

01:10

falls slower than the bowling ball or the marble is because the feathers shape

01:15

and mass make it more susceptible to air resistance like its densities different.

01:20

As all of these objects fall gravity is pulling them down and the air is pushing

01:25

back against them, but in a vacuum chamber with no air at all, all three of

01:30

these things will fall at the exact same rate. Now the bowling ball is definitely [Objects are dropped in a vacuum chamber]

01:34

falling with more force which will be obvious when it hits the ground, splat..

01:38

But the acceleration they all experience is the same: 9.8 meters per second squared

01:43

here on earth that's the acceleration of gravity for feathers, for bowling balls

01:48

and for everything else. So the correct answer here is D the acceleration is equal

01:53

for all of the objects and we don't have to worry about air resistance in a

01:57

vacuum. Oh and please remember that whole dropping things from the top of the [Police have the man in handcuffs]

02:02

Empire State Building scenario was just to show how things work, we shouldn't go

02:07

around dropping things off of building even if it's for science... [Bowling ball lands on securities head]

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