GROWING UP GOLDBERG FROM BOARD GAME TO EF 151 Team: Wesley King, Josh Elam, Kelsey McCoy THEN NOW

 PVC pipe (halved)  Golf ball  Wood (frame, beam, ramp, pivot point)  Blue string  UT Souvenir cup  Rocks  Dowel Rods  PVC pipe (halved)  Golf ball  Wood (frame, beam, ramp, pivot point)  Blue string  UT Souvenir cup  Rocks  Dowel Rods  Cotton ball  Blue sand  Mouse traps (3)  Pulley  UT VOLS sign  Cotton ball  Blue sand  Mouse traps (3)  Pulley  UT VOLS sign Salvaged Bought/Made

 Golf ball travels down tubing  Ball leaves ramp and sets off mouse trap chain  Final trap pulls stopper  Sand fills cup  Beam tips to release wood  Pulley defers motion to heavy weight to pull sign down  Golf ball travels down tubing  Ball leaves ramp and sets off mouse trap chain  Final trap pulls stopper  Sand fills cup  Beam tips to release wood  Pulley defers motion to heavy weight to pull sign down

How does it work?  Rolling Without Slipping  Velocity at the bottom of the ramp: 3.12 mph  Center of Mass  Sand must weigh.986 lbs. to pivot on the rod  Rotational Motion  Tension in string: 7.55 lbs.  Angular acceleration: 708 ft/s 2  Mass Moment of Inertia  Golf ball: 13,287 g-mm 2

Troubleshooting What design obstacles did we face? What held us back/slowed us down? What would we do differently?  Transition from design on paper to actual working device  Proper tools to cut PVC pipe  Design changes or alterations  Fatigue failure of blue string on mouse traps  Eliminate first day standstill by preparing tools/materials in advance

The Rube Goldberg device project allowed us to use our physics knowledge from EF 151 to not only design a working device, but also to translate the on-paper design to an actual, working machine. Conclusion