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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: 1.3 Object Interaction and Forces 236 Views


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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 almost  the same thing, right?

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Transcript

00:00

Thank you We sneak and here's yours from obtuse your

00:05

brought to you by waves We tried to go surfing

00:08

ones but apparently it's not cool for surfers toe wear

00:11

water wings All right check out the following diagram Given

00:15

the plot for velocity above which of the following plots

00:19

marks displacement and which marks acceleration here your potential answers

00:27

It will answer this question There are a few important

00:29

things to remember First thing to remember is that calculus

00:32

is fun Just keep repeating that to yourself over and

00:35

over until you really start to believe it We also

00:37

need to remember that velocity is the slope of the

00:40

plot for displacement versus time and acceleration is the slope

00:45

of the plot for velocity versus time Oh we almost

00:48

forgot the third thing to remember when plotting the slopes

00:51

of waves like this is that the slope of a

00:53

sine wave is a co sign way So in the

00:56

slope of a co sign wave is an inverse sine

00:58

wave a negative sign Wake now that we've got all

01:01

this down let's just take a look at our first

01:03

plot This first part sure looks like a co sign

01:06

Wave tow us So if this is the plot for

01:08

velocity and velocity is the slope for displacement versus time

01:12

than the plot for disco placement will be a sine

01:15

wave if we look at our three choices will see

01:17

that plot is a co sign Wave b is a

01:20

negative sign wave and see is a sine wave also

01:23

looking at our original plot for velocity the second part

01:26

of it the flat line is a constant negative value

01:29

right Well after all the whole thing is below zero

01:31

on the y axis So philosophy is a constant negative

01:34

value in this plot the displacement plot has to include

01:38

a segment with a constant negative slope and plot c

01:41

is the only one that fits the bill Now remember

01:42

what we said earlier Acceleration is the slope for velocity

01:46

If velocity kicks off with a cho sun wei acceleration

01:49

starts with a negative sign and just to be clear

01:52

that's s i n e s i g and also

01:55

the slope of a flat line is zero So the

01:57

acceleration plot should also be zero for the second segment

02:01

Looking over our plot options we only have one negative

02:04

Sine wave and only one with a segment that has

02:07

a flat line of zero Lucky for us they're both

02:09

part of a plot B If we take all that

02:11

we just did Well we'll see The correct answer is

02:13

option d plot See mark's displacement while plot b marks

02:17

acceleration that was a hard one Clearly waves and physics

02:21

can be tricky very very tricky but they're usually safer 00:02:24.17 --> [endTime] than waves in the ocean Please

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