Car Racing Andrea Boyer, Paxton Jones, Eric Tabor, Chris Tippitt

The Group Andrea Boyer – concept, journalist/editor, calculations Paxton Jones – concept, construction, supplier Eric Tabor – concept, construction, supplier Chris Tippitt – concept, construction, supplier

Design Overview Purpose: to start an electronic device Materials used: tubing, wood, wire, ball bearing, popsicle sticks

Calculations Velocity of the impact of the ball bearing: mgh = (1/2)mv f 2 + (1/2)IW f 2 mgh = (1/2)mv f 2 + (1/2)((2/5)mr 2 ) (v 2 /r 2 ) gh = (1/2) v f 2 + (1/5) v 2 gh = (7/10) v f 2 v f = [(10/7)(gh)] 1/2 v f = [(10/7)(32.2 ft/s 2 )(2.625 in)] ½ v f = 30.1 ft/s 2

Calculations, cont. ∑T = I α r(F)(sin θ) = (1/3) mr 2 α r(mg)(sin θ) = (1/3) mr 2 α (g)(sin θ) = (1/3) r 2 α α = [(3g)(sin θ)] / r = [(3)( 32.2 ft/s 2 )(sin(39.27))] / (15.5 in) α = 3.95 in/s 2

Issues The ball bearing did not travel smoothly down the wooden ramp we originally planned to use Setting up the plastic tubing in a way so that the ball bearing would travel Determining what device we wanted to trigger

Conclusion Trial and error is crucial in creating a device such as this Teamwork plays a major factor in projects This project allowed us to put everything that we learned in 151 to use