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Clockworks. Curt Huddle Andrew Jackson Josh Kerr Sam Moss. Overview. Objective Design Aspects Energy Conversion Processes Wrap Up Questions. Objective. Turn off an alarm clock. Design Aspects. Alarm goes off, winding a string connected to a rat trap
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Clockworks Curt Huddle Andrew Jackson Josh Kerr Sam Moss
Overview • Objective • Design Aspects • Energy Conversion Processes • Wrap Up • Questions
Objective Turn off an alarm clock
Design Aspects • Alarm goes off, winding a string connected to a rat trap • Rat trap is sprung, pulling base out of a domino structure • Structure falls, dropping a weight • Weight pulls a string, releasing a car down the track • Car hits clock and turns off alarm
Energy Conversion Process • Potential Energy of the Spring • Force measured as 9.5 lbs • Distance from the bar to the middle = 3 inches • PE = 3*9.5*Pi = 7.46 ft-lb
Energy Conversion Processes • Potential Energy of the dropping weight • Measured at the top of the track • Height = 2.25” • Mass = .013 slugs • PE = mgh = 2.25*.013*32.2=.0785
Energy Conversion Process • Kinetic Energy of the car • Measured at the end of the track • HeightI = 3 ft • Mass = .0033 slugs • V1 = (2*32.3*3)^1/2=13.9 ft/s • KE = .0033*32.2*3 = 0.319 ft-lb
Energy Conversion Process • Kinetic Energy of the car up the ramp • v2=(2*32.2*2")^1/2=3.28 ft/s • v1-v2=10.6 ft/s • KE = .5mv2 = 0.018 ft-lb
Efficiency • Eff = work out/work in • Total work out =0.0167 ft-lb • Total work in = 7.88 ft-lb • Efficiency of system = 0.212%
