Air Power: Making a Hover Craft (Document)
Air Power: Making a Hovercraft (en español) (Document)
(bubbling) (fan humming)
SHING YING: This is a hovercraft. It floats on a cushion of air that's been created by fans. People ride around on this hovercraft for fun. Here's what a hovercraft might look like in the future. In 'Star Wars', instead of cars, people use hovercraft for transportation.
ALINE: And here's a hovercraft that you can make. Oh, my goodness.
SHING YING AND ALINE:(both giggle).
SHING YING: Melissa F. of Shoreline, Washington, and Josh G. of Merriam, Kansas, sent us the idea.
ALINE: So, here's what you'll do to make one. First, take a ball-point pen and poke a hole in the center of a film canister. And I already poked my hole. Then do the same thing to a plastic plate, see? Mine is already there.
SHING YING: Put the film canister over the hole in the plate and use poster putty to stick it on like this. Okay, you want to help me?
SHING YING: It's a little bit hard to rip.
ALINE: Glue is like glue.
SHING YING: Okay. It helps if you make a log roll, and then just circle it around. Like this. Yep, okay.
ALINE: Put both things right in the center.
SHING YING: Oh, so the air can come through and keep it compact.
ALINE: Okay, that looks good. Then blow up a balloon and put it over the film canister.
SHING YING: Do you want me to try?
ALINE: Sure. That looks good.
SHING YING: Twist the opening of the balloon so that you don't let any air out. Then stretch it over the film canister. Okay, make sure the opening of the balloon lines up with the hole in the film canister.
ALINE: Then put your hovercraft on a smooth, flat surface, like this table. Then give it a flick. It's floating on air. You just can't see it. If I go like that...
SHING YING: You still can't see it.
ALINE: Because it's so thin. It's really cool.
SHING YING: Here's the science scoop for how this hovercraft works. Our hovercraft moves because it's floating on a cushion of air. The air has to go somewhere, so it floats out of the balloon and under the plate. The layer of air under the plate takes up space, so it keeps the plate and table from rubbing against each other.
ALINE: See, if I push this plate when there's no air underneath it, it doesn't go very far. This is because of friction. Friction is a dragging force which occurs when two objects slide against each other, but the hovercraft doesn't have very much friction because it rests on air.
SHING YING: It's like an air hockey game. When you turn the game on, air comes through these holes. The puck is able to rest on air, so there's very little friction. (game humming)
ALINE: Good job!
SHING YING: Thanks. Okay. But when you turn the game off, there's no cushion of air, so the puck isn't able to float across the board.
ALINE: Experiment with hovercrafts at home. Change one thing, like the size of the balloon, the type of plate or the size of the hole in the plate. These are the variables. Predict what you think will happen and test it out.
Academic standards correlations on Teachers' Domain use the Achievement Standards Network (ASN) database of state and national standards, provided to NSDL projects courtesy of JES & Co.
We assign reference terms to each statement within a standards document and to each media resource, and correlations are based upon matches of these terms for a given grade band. If a particular standards document of interest to you is not displayed yet, it most likely has not yet been processed by ASN or by Teachers' Domain. We will be adding social studies and arts correlations over the coming year, and also will be increasing the specificity of alignment.