STEM: Balloon Hovercraft

1. Balloon Hovercraft use balloon, lid or bottle top and a __________________.

• a. straw

• b. tissue

• c. plastic bottle

• d. CD

2. Where is the air for the hovercraft comes from?

• a. straw

• b. balloon

• c. plastic bottle

• d. CD

3. The levitating hovercraft work by forcing air to the _______ ___________.

• a. CD's surface

• b. balloon

• c. CD's bottom

• d. CD hole

4. The cushion of air beneath the CD will reduce the ___________________ drastically.

• a. gravity

• b. weight

• c. friction

• d. mass

4. Friction is a force that act in _____________________ direction.

• a. straight

• b. diagonal

• c. the same

• d. opposite