A Force is a Push or Pull)

Hi, I am Jared. Welcome to Fun Science Demos. The big idea today is that a force is a push or a pull. Through science we have discovered that if I give a little push, a little force is created and if I give a big push, a big force is created. But it is not just us who can do the pushing and the pulling and create the force. Lots of other things can create the force, like air. So take a look at this. I am going to put some air in this balloon and that air is going to have a force. Then we can have some fun with it. So the air is exerting a pressure on the balloon and I am going to put it against the table. What do you think is going to happen? I think the air is going to exert a force. It is going to push down on the table. What happens when it pushes on the table? The table is too heavy to go anywhere, but the balloon is light enough to take off. It almost looked like a jet taking off. In fact, that is how jets move forward. That is not how they fly. They use their wings to fly, but the jet engines, they take air in and force that air out with a lot of pressure, causing the jet to move forward. Kind of like what we are about to show you. Check this out. So I have strung a fishing line across the room and I have this little straw slider threaded right through it. I am going to attach a balloon, fill that balloon with air, let it go and see what happens. So now I have the balloon attached to the straw and I have air under pressure in the balloon. I just need to move the camera so that you can see the whole launch. So we are cleared for takeoff. 3, 2, 1. So what happened there? Well, when I let the balloon go, as I was holding it on the table, the air was pushing against the table. When I let the balloon go here, air was actually pushing against air. That is what moved the balloon forward. Forces. A force is a push or a pull. Air can push. Science is cool. Thanks for watching. Do not forget to check out our links in our video description.