hi I'm Jared welcome to fun science
demos today we want to take a look at
two forms of energy sound and light and
we want to see how those forms of energy
move both sound energy and light energy
travel in waves and sound waves are a
lot slower than the light waves light
waves travel really really fast that's
why when we see the light from a
lightning bolt it's always before we
hear the sound waves of the Thunder so
we can use this slinky to show you how
sound waves and light waves travel I'm
going to put some energy into this
slinky and I want you to watch how that
energy bounces back and forth down the
slinky watch how it moves if you look
carefully you can watch the energy move
in waves down the slinky and bounce back
and forth that slinky was cool but we
wanted to make a different wave machine
to show you how energy travels in waves
to do that we use duct tape plain wooden
sticks and lots of candy now we're going
to take this outside
stretch the wave machine out and put
some energy into the wave machine so you
can see how it works so now we get to
see this wave machine in action a wave
is energy so I need to add some energy
to this wave machine and when I do that
I want you to watch that energy move
down the machine from one end back to
the other watch
did you see the energy move down the
machine and then back and then back down
the machine and back toward me
remember sound and light are both energy
and they travel in waves a lot like this
sound energy and light energy are
traveling in waves let's see what
happens when we add more energy to our
wave machine we get a nice clean crisp
wave that travels down the machine and
back and down and back and down and back
the candy wave machine it was so cool to
see how that wave energy traveled down
that wave machine but if you wanted to
explore waves on your own there's a
great simulation put out by the people
from Phet and we're going to zoom in and
explore it a little bit to see what that
does the simulation is called wave on a
string so let's take a look and see what
it can do explore it well I see a wave
machine that looks a lot like our wave
machine it's stretched out and just like
we put some energy in our wave machine
to see that wave travel let's put some
energy into this wave machine and there
the wave is you can see it traveled down
from one end and back to the other let's
do it one more time what happens if I
make that energy bigger if I introduce
more energy I can turn up a little dial
here and make my wave bigger I can turn
it up all the way put more energy into
it and you can see my wave gets bigger
the other thing we can do if we wanted
these waves to come automatically as we
can hit this button up here and the
Machine makes the waves come
automatically we can also hit this
button up here if we wanted to collect
some data and really measure things
rulers come on to the screen there's so
much that the simulation can do you can
explore it on your own sound and light
energy traveling waves you can try
making your own wave machine or check
out some cool simulations on waves if
you want to learn even more about sound
energy and light energy and how they
travel check out our links in the video
description sigh
is so cool thanks for watching