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AP Physics 1 Videos 86 videos

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AP Physics 1: 1.5 Waves 12 Views


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AP Physics 1: 1.5 Waves. What can possibly occur when the two waves reach each other?

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Transcript

00:04

And here's your shmoop du jour brought to you by superposition

00:07

which of course is when Superman does yoga yeah like that..check out the [Superman doing yoga]

00:12

following diagram....two waves of equal amplitude move [A diagram of waves on a laptop screen]

00:17

toward each other with equal velocity when they reach each other which of the

00:22

following can possibly occur? it's like two answers [pause button and car beeps]

00:31

all right so what happens

00:32

when two waves of run into each other along their travel do they crash into [two cars collide with each other]

00:37

each other like cars and stop moving or do they keep on moving like nothing

00:41

happened because well they're just that chill well the answer is all of the

00:45

above they crash into each other and they also keep moving wait they crash [cars collide and continue moving in opposite directions]

00:50

into each other and they keep moving yeah waves are weird like that they're

00:55

kind of oblivious to the material world and just keep moving like us when we're [man studying while walking around a bedroom]

00:59

studying for a big test like that remember that a wave travels through a

01:03

medium but it doesn't transport it so when two waves collide matter isn't [waves colliding]

01:08

colliding just energy is colliding the energy keeps on moving after the

01:14

collision so answer A; not one of the right choices when waves do collide then

01:20

we're dealing with superposition well superposition means that colliding waves

01:24

will combine to make one single wave at the moment of collision the wave that [Two waves combine to form a single wave]

01:29

results from the collision will equal the sum of the component waves and how

01:33

the waves interact with each other is known as interference well interference [A wave in a phonebox and a phone outside of the phonebox]

01:37

can be constructive or destructive kind of like criticism except less likely to

01:42

make us cry/ Constructive interference occurs when waves of the same sign

01:46

collide the amplitudes of the waves combine to form a larger amplitude like [Two positive waves collide forming a larger amplitude wave]

01:52

that it's bigger and bigger destructive interference is what happens when a

01:55

positive wave collides with a negative wave like flattens it out in this case

02:01

the waves add up to have a smaller amplitude because they cancel each other

02:05

out the ways have to have the same amplitude to cancel each other out [Waves cancel each other and flat line appears]

02:08

completely so our correct answers are B and C either of these are

02:13

possible, depending on whether the waves have the same sign or if they don't and

02:17

we've seen that waves do interact so D is definitely not correct but after they [People with waves for bodies interacting in a street]

02:23

meet the waves just keep on rolling, yeah waves are just zen like that and no

02:27

Superman doesn't actually do yoga that's because the well the lotus position is

02:31

his kryptonite.. Ow! [Superman in the lotus position]

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