The Physics of Bicycles Lab Report

The Physics of Bicycles Lab Report - The Physics of...

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The Physics of Bicycles Lab Report Jazmeen Suleman and Leah Brummelhuis March 14, 2013 Physics 1050-4
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Analysis: Table 1. Gear ratios for the bicycle from section one. Sprocket 28 38 48 14 0.50 0.37 0.29 16 0.57 0.42 0.33 17 0.61 0.45 0.35 21 0.75 0.55 0.44 24 0.86 0.63 0.50 28 1.00 0.74 0.58 Table 2. Revolutions, force, torque, work, and ratios of each rear sprocket. Number of Rear Sprocket Teeth Revolutions F t (N) Torque (Nm) Work (J) R b /R f τ b / τ f 14 2 7.13 2.32 29.2 0.50 0.46 16 1.72 9.13 2.97 32.1 0.57 0.59 17 1.56 10.8 3.51 34.4 0.61 0.69 21 1.33 11.6 3.77 31.5 0.75 0.75 24 1.19 13.3 4.32 32.3 0.86 0.85 28 1 15.8 5.14 32.3 1.00 1.02 Table 3. How much work and power each group member used while walking and running up the stairs. Group Member Weight (N) Height of Stairs (m) Time (s) Work (J) Power (Watts) Walking Running Walking Running Jazmee n 495 3.85 20.9 7.59 1906 91.2 251 Leah 530 3.85 20.6 9.72 2041 99.0 210 Table 4. Force, power, and speed required for each pair of sprockets. Number of Teeth Force Required (N) Power Output (Watts) Speed (m/s) Front Back 28 14 113 123 4.08 16 99.2 107 3.57 17 93.4 101 3.36 21 75.6 81.7 2.72 24 66.1 71.5 2.38 28 56.7 61.3 2.04
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38 14 154 166 5.54 16 135 145 4.85 17 127 137 4.56 21 103 111 3.70 24 89.8 97.0 3.23 28 76.9 83.1 2.77 48 14 194 210 7.00 16 170 184 6.13 17 160 173 5.68 21 130 140 4.67 24 113 123 4.08 28 97.2 105 3.50
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