Hi, I am Jared. Welcome to FunScienceDemos.
Believe it or not, this is a live picture of me.
It is pinched and stretched. the shape is totally different, but this
is still me, and believe it or not, this is the big idea for today.
Physical changes.
Take a look at all these different pictures of me. in each one of
them, different parts of my face are shaped differently, or stretch
differently, but guess what? every single one of them is still me.
Scientists call that a physical change.
I can change the shape of something, the size of something,
I can stretch something, I can pound something, I can flatten something,
I can tear something, but I am not changing what it is.
In our world we change things all the time. We crumple things, we flattened things out...
We can tear things, but we are not changing what that thing is.
It is still the same matter.
This is still a piece of paper. We are going to use this piece of paper to take
a closer look at physically changing matter. Remember we are not changing what it is.
We are just changing its shape.
To take a closer look at physical changes,
We have made some paper airplanes. These planes may look differently, but remember
they are all just made out of paper. I may have folded them and they may have
changed shape and size, but they both started out just like this piece of paper.
We changed what they look like, but not what they are.
It is still made of the same stuff. Now, the cool part about this is that when we
change the shape of this paper, we have also changed what it can do.
This first design is top secret. I am not going to share how I made this. maybe you can come
up with your own top-secret design, but for now I am going to change the shape
again to make sure nobody can figure out how to make it. Enter the paper shredder.
This paper shredder is going to change the shape of this paper so nobody can get it.
That is right, but believe it or not it is still just paper.
The paper changed shape and size. that actually is still paper.
This used to be my paper airplane, now it has gone through a physical change.
Remember we change the shape of things, so they can do different things.
This piece of paper does not fly very well. It just sort of floats down, but this piece
of paper - let us check out how this one flies.
Not too bad, and all I had to do
was change the shape of the piece of paper, from this one piece of paper.
You can make so many different designs of paper airplanes. You can make some that
fly really really far, you can make some that flight really really fast. You can
make some that do loops in the air. You can make some that fly slowly, but
what are you really doing that make them all different? I am making a physical change
on a piece of paper.
So far we have been talking about changing what something
looks like, but not what it actually is. This is still paper. I have folded this
but it is still paper, but through science we discovered there are actually other changes too.
Check this out. I am going to change this piece of paper by lighting it on fire.
I am just going to let the little tip of the wing burn down and then blow it out.
Wow, look what happened! I have changed what this paper looks like, but I have also
changed what it is.
I started out with a white piece of paper, and I am left with this black char.
Through science we have discovered that this black char is actually new stuff.
It is new matter. I have done more than just change this paper physically.
I have changed what it is made of. I have changed what this match is made of. it was
made of wood and some other stuff, now look, totally different.
Scientists call that a chemical change.
Physical changes are all around us, whether you are tearing things, chopping things,
Slicing things, grating things,
grinding things, or even crushing things. All of those things are physical changes.
Who knew physical changes could be so tasty?
If you want to learn more about physical changes, check out our links in the video description.
Science is so cool, especially when we get to eat it.
Thanks for watching.