1. The Roller Coaster Project Group Members: Jonny Weigand, David Upchurch, and Jacob White “The Pocket Rocket” picture

2. Brainstorming…

3. Actual Design 2 pieces Initial drop (.5 sec) Spiral (8 sec) Connection to other tubing (1 sec) Drop (.2 sec) Loop (.3 sec) Downhill roll to end (5 sec)

4. Energy Mass of ball = 0.0011 kg COE for 1 st drop – mgh = ½ mv 2 + mgh COE for start of spiral – ½ mv 2 + mgh = ½ mv 2 Ball stops at connection COE for drop, loop, and decline – mgh = ½ mv 2 Energy loss from friction – mgh = E loss

5. Issues Fitting length of tubing in constraint Mounting supports vertically straight Plastic tubing too stiff Reinforced tubing too rough Making loop with limited PE Tubing shifting

6. Conclusions Calculated speed too high Friction of reinforced tubing More flexible tubing Simpler preliminary designs

7. The End

8. Construction Procedure – Drilled 5 holes in base board for pvc supports – Cut pvc supports to length – Assembled supports on base board – Measured each guide pipe height – Zip tied the guide pipes at respective heights onto the supports – Weaved the plastic tubing through while testing periodically – Tested and connected bottom tubing

9. Construction Materials – 1 steel ball bearing ($0.40) – 20’ of ½” pvc pipe ($8.50) – 4 ½” pvc couplings ($1.00) – 25’ plastic tubing ($5.00) – 13’ rubber reinforced tubing ($9.10) – 10 nails ($0.50) – Super glue ($1.00) – ½ m by ½ m by ½ in piece of particle board ($3.00) – 1’ of 2 x 4 ($1.00) – 50 zip ties ($3.00) – Ductape ($2.00) Total cost = $34.50