 Welcome back to Kids Fun Science. My name is Kim and today's experiment is the rubber band cup rocket launcher. So basically you need rubber bands, you need three or four cups and then you're off to ready to go. So one cup is empty, no rubber band. That is your launcher and then you're going to use another cup and you're just going to put a rubber band all the way around it and that's going to be your rocket, right? So Sam's pretty easy, grab a cup and just put a rubber band all the way around it for the first one so we only have one rubber band. For the second experiment just add a second rubber band in a plus sign right there. You can tape it down if you want to but you don't need to. So it was just a regular cup and no rubber band and you put it down and then you're going to take your rocket with a rubber band and you're going to stretch it down to the bottom here as far as it'll let it go and then you're going to try to release both fingers at the same time and it shoots off. So pretty good. They're going to angle off if you don't do it exactly. If you do this side one side then let go here it's going to angle to the side as you kind of saw there. So we're going to try to make an attempt to do it again with the smaller cups and we'll let go and two shot that way there but hence the potential energy is throwing up then kinetic energy is released. We're going to go one more step up to see by increasing it to two rubber bands will it go a little higher. The first one went about three feet. We're going to measure it in a little bit but we're going to see if this goes any higher. So we're going to take our launcher. We got two rubber bands here and they just flip it right over put it right in the middle here and then try to release it at the same time. That's the tricky part but it's still going to launch and definitely has a little more power. It angled still probably about the same height but it felt like it was going up a little bit faster. So let's try a smaller cup same thing we got two rubber bands. These are both 64 so they're a little thicker on the rubber band pull it down you can feel I can feel the tension already so that potential energy is just storing in it. That definitely went the farthest that went probably about four feet so that definitely went a good good distance on there. All right so we're doing the larger cup now I think I'm just gonna we know the we know the we know that the rubber bands can go higher so I'm just going to skip the single rubber band here we're going to go double rubber bands double rocket so double here show you in a second so I got I got two rubber bands on each one we got one launcher right here and then we're going to put the first rocket down and then the second rocket down and we're going to see if we can hit the ceiling with these larger rubber bands pull down that definitely hit the top of the ceiling very hard and get straight back down definitely the highest launch so far so the results are when you have the larger cups and the double rubber band it definitely shoots the highest so I will come back and tell you the science behind it right after this so potential and kinetic energy the science behind this is as you stretch down the rubber band over the cup you're storing up energy by putting tension on the rubber band the stored up energy is called potential energy the more the rubber band stretches the more energy that is stored this is why the further the launcher is pressed down over the cup the further it flies up when you release the rubber band the tension is is released it's the potential energy that's transformed into kinetic energy which is energy in motion I hope you like this video if you did remember to click thumbs up and to subscribe thanks for watching