Greenfield Jr. High
Gilbert, AZ,

Online Contest:
Inflate A Balloon and Pop It!
Online Division I - Ages 11 - 14 (Middle School)
Team Leader: Erik Gillman
Team Members: 12
Invitations: 0

What we're studying:

Our Team Leader's favorite quote:
"Even a bad day of math is better than shoe shopping!"

Why we think we should win:
This year is Arizona's 100th birthday, and that is our machine's theme!

Suggestion for next year's challenge:
Launch a 2-Liter Water Rocket

Welcome, Rube Goldberg Machine judges! We are the Greenfield Junior High Future Business Leaders Club. Our "product" for this year was to build a Rube Goldberg Machine and enter it into the Middle School Contest. Since 2012 is Arizona's centennial year, we chose "Happy 100th Birthday, Arizona!" as our theme. We hope you like it!

Our Step List

GRJHS FBLA Rube Goldberg Machine: Arizona’s 100th Birthday

1. A COMET (golf ball) streaks across the sky (rolls down ramp) and crashes into Arizona
2. It hits a prehistoric CREATURE (dinosaur), knocking it into a CRATER
3. String attached to dinosaur pulls switch #1 to “on”
4. Switch #1 applies power to electric train and also to light (the sun)
5. CHOO-CHOO moves along track bringing settlers to enjoy Arizona’s sunny CLIMATE
6. Train runs into CATTLE, which die and fall like dominoes
7. Last cow falls on mousetrap, which springs and pulls on string
8. String turns on switch #2, applying power to fan (cotton gin)
9. Fan blows COTTON balls into the air
10. Switch #2 also applies power to solenoid which knocks golf ball (marble) onto golf COURSE
11. Marble rolls down ramp, hitting larger marble which falls into CUP and onto switch #3
12. Switch #3 applies power to sprinkler valve which opens
13. This allows compressed air from cylinder to flow into balloon
14. Balloon (enclosed in CITRUS orange peel) is inflated very quickly
15. Orange peel falls off, revealing the balloon with the message “Happy 100th Birthday, Arizona!”
16. Large marble continues down COPPER mine and hits Hot Wheels ore CART
17. CART falls into bucket #1 which is connected by pulley to bucket #2
18. Bucket #2 goes up bringing COPPER out of the mine
19. Bucket #2 also hits another Hot Wheels CAR at top of ramp
20. Hot wheels CAR (with tourists) goes down into the Grand CANYON
21. At the bottom of the CANYON, the CAR runs into a large saguaro CACTUS which tips onto balloon, popping it!

• Total # of steps = 21
• Elapsed run time = about 20 seconds

Our Close-ups: Photos

Our Close-ups: Favorite Step

Our Close-ups: Task Completion

Our Machine Explaination and Walkthrough

Our Machine Run Videos

Machine Run #1
Machine Run #2