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The Roller Coaster Project

“The Pocket Rocket”. The Roller Coaster Project. picture. Group Members: Jonny Weigand , David Upchurch, and Jacob White. Brainstorming…. Actual Design. 2 pieces Initial drop (.5 sec) Spiral (8 sec) Connection to other tubing (1 sec) Drop (.2 sec) Loop (.3 sec)

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The Roller Coaster Project

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

  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 1st drop • mgh = ½ mv2 + mgh • COE for start of spiral • ½ mv2 + mgh= ½ mv2 • Ball stops at connection • COE for drop, loop, and decline • mgh = ½ mv2 • Energy loss from friction • mgh = Eloss

  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

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