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Clockworks

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

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  1. Clockworks Curt Huddle Andrew Jackson Josh Kerr Sam Moss

  2. Overview • Objective • Design Aspects • Energy Conversion Processes • Wrap Up • Questions

  3. Objective Turn off an alarm clock

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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%

  10. Questions

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