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AP Physics 1 Videos 86 videos

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AP Physics 1: 1.1 Waves 68 Views


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AP Physics 1: 1.1 Waves. What is the frequency of this wave motion?

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English Language

Transcript

00:00

Thank you We sneak and here's your chum up duis

00:05

You are brought to you by wave motion a topic

00:08

of great importance to physicists and to beauty pageant contestants

00:12

everywhere All right a spring bounces up and down such

00:17

that the bottom of the spring hits the ground every

00:19

two seconds One two like that What is the frequency

00:23

of this wave motion frequency and hear The dental answers

00:27

aren't all in hurts All right here we go Well

00:31

lot of the time in physics we use springs to

00:33

represent waves Why Because everybody loves this slinky that's Why

00:38

And also because springs and waves share some important features

00:42

If we think of a vertical spring going up and

00:44

down it has an amplitude like a wave does It

00:47

also has a frequency and a period So a spring

00:51

is a good stand in for the features of a

00:53

wave in this question were given the period of the

00:57

spring will the period of a wave is thie amount

00:59

of time it takes to complete one cycle In this

01:02

instance we can think of the spring hitting that ground

01:05

as the starting point of the period Right there it

01:08

springs up to its maximum height then comes back down

01:12

to the ground again Well that's one cycle one period

01:14

right there The frequency of a wave is the number

01:17

of cycle's completed by a wave per unit of time

01:21

Well looking at these two functions we can see they're

01:24

related In fact they're reciprocal Meaning If you multiply them

01:28

well they equal one Okay well so our head doesn't

01:31

end up on a spring let's focus and look at

01:34

some numbers to make its all clear If a spring

01:37

has a period of one second meaning it complete one

01:40

cycle in one second then it also has a frequency

01:44

of one second But let's speed our spring up And

01:48

if a spring has a period of point two five

01:50

seconds that it has a frequency of four cycles per

01:54

second Right All right Well if we're only given the

01:57

frequency or the period we can figure out the rest

02:00

Reciprocal with a little algebra Anyway in this question we

02:03

know the period equals two seconds We also know that

02:06

the period times the frequency equals one So the frequency

02:11

has to equal one over two seconds Which means the

02:16

frequency equals point Five seconds four point five parts So

02:20

the correct answer is a as long as we remember

02:22

The reciprocal relationship between period and frequency will be able

02:26

to knock these questions out And as long as we

02:28

keep our hands slightly cup and just rotated on the

02:32

wrist like that we can knock this beauty pageant out 00:02:35.408 --> [endTime] too

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