The 3rd Trial

When we tested the balloon car at first it went really far, but we realized that the ground was uneven. We moved to an area that had more space and less bumps. We taped the 12" balloon so that the air could escape quickly and so that the balloon wouldn't get in the car's way. The car accelerated but hit a chair, so we couldn't tell exactly how far it could go. We could tell that the car was done by how fast it was going.

Rebuild Materials #3

Materials

• CDs for wheels 
• Corks for the axels (in the middle of the CD)
• Straws and Scewers for the axels to spin wheels
• 1.5 by 1.5 inch piece of cardboard for the balloon to sit on
• Egg Carton for the base
• Scewers to hold up the platform for the balloon to sit on
• Tape to hold the balloon down
• Hot glue to hold everything together

1st Attempts Fail

After changing the design, the wheels wouldn't turn when we attached the balloon and tried to make it go. Tomorrow during school, we will try a new and better design and test those.

2nd Design Materials

New materials that we used:

• Foam to hold the wheels in place, instead of erasers which were heavy and weren't affective.
• Scewers and Straws for the axles
• Egg carton for main body of car
• Cling wrap to make it more aero-dynamic
• CD's for wheels

Experimenting

After we made the first design, we tested the balloon car. When we tried using a straw with the balloon, it didn't move anywhere. Then, we tried taping the balloon to the car, but one end on the car was heavier than the other, so it flipped over. To fix this, we turned the car around, and taped the balloon on more, but the car turned because the wheels wobbled and were not centered.

1st Design Materials

Materials that we used where:

• Erasers to hold the wheels
• CD's for wheels
• Egg carton for the base
• Straws
• Scewers for axle