A Balloon Rocket (Forces & Motion Part 2)

A Balloon Rocket (Forces & Motion Part 2)


Hello, I am Jared. Welcome to Fun Science
Demos. In a previous video we made a two stage rocket out of two balloons in a
plastic cup and it works like this. This orange balloon is holding the white
balloon in place when I let go of the orange balloon, the air goes out and when
the orange balloon deflates, it releases the white balloon. A two-stage rocket!
Remember: a force is a push or pull. The air inside this balloon was pushing
against the table. It was pushing against the air around and it was even pushing
against the pull of gravity. Well today we are going to try and make another two-stage rocket with balloons but instead of a cup we are going to be using rubber bands and a binder clip. We are going to be using the binder clip to pinch the end of the balloon to hold in the air, and we found that just by
running two pieces of electrical tape on the inside of our binder clip allows
that clip to hold the air inside the balloon a lot better. So the first thing
I need to do after I have my balloon blown up and the binder clip securely on
the back is to put a rubber band around my balloon. And I might even want to go
with two because this rubber band is going to be holding another balloon closed right next to this one I have blown up. So I have two rubber bands here pinched around this
one balloon. Now I need to blow up my second balloon. Sometimes stretching it
makes it easier to inflate. Here we go. And I have my two balloons for my
two-stage rocket. Now I have to be able to take the end of this green balloon
and slip it under my rubber bands. If my rubber bands are tight enough, it will keep
the air of the second balloon inside the balloon. I am almost ready to launch. Now
this next part it can get tricky. You might even need a friend to help you out.
I am going to take a little bit of a larger over band and I need to slide the rubber
band over my green balloon and my orange balloon, so that it actually lines up to
look more like a rocket. It is definitely easiest if you have two people trying to
work on this and having one person hold the balloons another person able to put
the rubber band over top of the balloons. You notice I had to slide this rubber band further down because this rubber band kept popping off. So it is a process. Its science! So I am ready to launch
and I am going to hold the orange balloon so you can watch when I remove the binder
clip, the air will come out, this orange balloon will get smaller and then
eventually it will release this green balloon, and that is the second stage of our
rocket. Are you ready for launch? So I am actually gonna take the binder clip off
first, because I want you to watch right here at the green balloon and the orange
balloon where they meet so as I let the air out, watch what happens to the green
blood. Here we go. It gets smaller, I let it go. The green balloon took off. So we pulled the camera way back so you can get a better look of our two-stage rocket in action. Let’s launch this thing and see how she flies. 1, 2, 3! The green one released, we had a successful
two-stage launch! Just interesting to point out the rubber bands stayed on the
first stage of my rocket, so as this one got smaller. It eventually released the
second part of my rocket, the green balloon. Now we can do a whole lot of
other really neat things with our rocket. Designing your own is where science
really gets creative and fun! What if I use longer balloons? Could I make round
balloons work? What about these? These actually look like they have bubbles and
ridges in them. It would be a lot of fun, but take a look at my design idea. I wanted to see
what would happen if instead of one booster, my rocket actually had two
boosters that can go off, power this, and then the green balloon part of my rocket could finally be launched into space. I wonder how long I could get this to stay in the air. I wonder how far I could get this to
go. I could measure all kinds of things and document my science and really make
myself into a scientist at work. If you want some other design challenge ideas,
if you want to learn more about forces, check out our playlist. Science is so
cool, especially when it involves taking off because who knows where it will take
us. 3, 2, 1! We have a successful liftoff!

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