Video Description -- CD Hovercraft
In this activity, you will be building a miniature hovercraft with a CD and a balloon.
Materials Needed:
• 1 CD (preferably an old one since it will be damaged)
• 1 Sports bottle top (pop-top)
• 1 balloon
• Adhesive - hot glue is used in the video with tape to make sure it's insulated. Craft glue and super glue can also be effective as long as you can seal correctly.
Procedure:
1. Glue the bottom portion of your bottle top on to the middle of the CD. Make sure to position the hole of the CD under the cap. Twisting the cap once the glue is being placed helps to make a seal.
2. Once glued, close the top by pushing in.
3. Blow up your balloon.
4. Stretch the balloon mouth around the pop-top so that it stays put. With the pop-top closed, the balloon should not be leaking air.
5. Place your hovercraft on a clean, smooth surface.
6. Open the pop-top with the balloon still attached. The air from the balloon should lift the CD. Give it a nudge to make it slide around.
7. Experiment: The balloon will constantly fall off to the side and increase friction. It will also unbalance the CD. What can you add to the hovercraft to keep the balloon from falling off to the side?
8. Experiment: Is it possible to modify your hovercraft so that it will move forward by itself? What would you need to do?
Science
• When you fill up a balloon, you're pushing the balloon outwards with your air. The balloon, due to its elasticity, will constantly try to force the air out.
• When the balloon is placed on the hovercraft, the balloon will force the air through the pop-top opening and leave through the CD hole. Once it gets to the bottom, the force it exerts is greater than the CD's weight. The air will move in all directions outwards, creating a cushion of air between the hovercraft and the surface. Due to the CD's smoothness and the cushion of air, the hovercraft should have less friction and glide easily.
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