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Object Interaction and Forces Videos 13 videos
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.
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.
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...
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?
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
Full Transcript
- 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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