Hello people, today this live experiment is all about rockets.
I'm going to make one of the simplest rockets you probably seen it before.
We're just gonna have a quick look at different things that can make it go further or not
as far.
Now a rocket, basically works by having a propellant inside it that gets shot out in
one direction which causes the rocket to go in the other direction.
So you can change how fast you send the propellant out to change how fast the rocket goes.
Now there are different things you can use for propellants, and normally on rockets they
use fuel which is combusted.
But here we're gonna use a different type of set up.
So for this all you're gonna need is a plastic bottle, some water, a pump, a cork, and if
the cork isn't big enough to fit into the bottle you can stick some duct tape around
it, and also what we've got here what we've put through the cork, is actually an inner
tube, you know the inner tube that has the little valve coming out of it, and we've cut
the rest of the inner tube off, and what we've been left with is this valve.
We've had to cut the cork in half to let the valve go through.
Now if you want you can actually stick a nail through, you can drill through, or get a screw
and screw through.
Whatever works for you just make sure you don't screw through your hands.
So there you go.
Now, lets put them together and go and try it out.
Right, I've got my bottle and I'm gonna send it off.
What I've done is attach these two bits on it just to give it a little guide as we send
it off, just some sellotape and a hose.
We can guide it off at 45 degrees so we can see how far it goes instead of shooting it
straight up.
So I'm gonna put the water in about a quarter full, so this is a two litre bottle so I'm
gonna put in about 500ml.
The more propellant you have the more force it will be able to send out in this direction,
so that this goes out that way with more force.
It's an equal and opposite reaction according to Mr Newton, Issac Newton.
So I'm gonna put the cork in the top, stick it on a launch pad and fill it with air, fill
up the pressure, and hopefully watch it go.
Yeah, I'm gonna measure that and see exactly how far that went.
That is taking us up to about 40 feet and 5 inches that's about 12 meters 3 centimetres.
Ok, let's see if we can increase that.
What we want to do is to check to see if it can go further.
I'm gonna add more propellant so hopefully it will not only be able to fly faster but
further as well.
So here's more propellant we're gonna put in about a thousand millilitres this time
which is about twice as much as before to see how fast it goes.
So I'm gonna go for it.
More propellant let's go!
I hope there was no birds in that tree.
Let's see how far that went.
So that's about 14 meters 70 roughly, or 48 feet 4 inches.
So let's try it again with no propellant no water and just air and see how far it goes
and we shouldn't expect it as far as this or as far as the other one.
So let's go.
Well, that don't look pretty good, let's have a look.
So there we got about just over 20 feet which is about 6 meters 20, 6 meters 25.
So without any propellant in it at all, and just having air in it, it's gone about 6 meters
and 20.
Now the important thing to remember is it's actually gonna be propelled for the first
part of the journey and after that it's just basically a ballistic object.
So there you go you've seen an experiment with different amounts of propellant different
amounts of water and different amounts of air.
So you can see with it was totally propellant no air, no water, it didn't go as far.
You can see when we had more water in it more propellant, it went a bit further.
But you can check out the ratios yourself how much the pressure ratio and the amount
of water makes a difference with yours.
Try it with different sized bottles, and well, let us know how you do.
Alright, that's Head Squeeze out!