Balloon Hovercraft

We have been learning how to write scientific reports. We did an experiment and created a Balloon Hovercraft.

B E G I N N I N G	TITLE	Balloon Hovercraft
	QUESTION	How does a hovercraft hover?
	HYPOTHESIS	I predict that the cd is going to spin on the table like a lawnmower.

M I D D L E	EQUIPMENT  AND MATERIALS:	Cd, bottle lid, ballon.
	PROCEDURE:	Step 1: Using a hot glue gun glue the bottle cap over the CD hole. Step 2: Blow up a balloon. When it is fully inflated twist the end so no air comes out.   Step 3: Stretch the balloon over the end of the bottle cap.  Step 4: Open up the cap and place the CD on the surface.   Step 5: Untwist balloon and let go.
	OBSERVATIONS/RESULTS:	I saw the balloon get smaller and smaller as the air was coming out and the disc moves around.  It slows down and then stops.

E N D

CONCLUSION:

The air from the balloon creates a cushion of moving air between the disc and the CD and reduces the friction across the surface.