What is the Effect of Various What is the Effect of Various Road Surfaces in Beijing on the Road Surfaces in Beijing on the
Deceleration of a Bike when the Deceleration of a Bike when the Brakes are Fully Applied? Brakes are Fully Applied?
Description of the ExperimentDescription of the Experiment
Raw DataRaw Data
Surfaces Gravel Road Tile Road Grass Wet Road
1 2 3 1 2 3 1 2 3 1 2 3 1Distance / ± 0.05 m
6.37
6.21 6.03
5.17
5.05 4.98 5.42 5.28 5.33
4.80
4.64
4.69 7.46
Time 1 / ± 0.1 s 7.43
14.40
9.03
5.97
15.20
17.50
6.75 5.93 5.56
4.75
5.03
4.87 9.68
Time 2 / ± 0.1 s 5.93
13.19
7.50
4.50
13.84
16.19
5.13 4.25 3.97
3.44
3.77
3.68 7.76
Velocity / ± 0.5 km/h
25 25 25 25 25 25 25 25 25 25 25 25 25
Analysis of the DataAnalysis of the Data
Surface Gravel
Road Tile Road
Grass Wet Road
Trial 1 3.672 4.829 4.481 4.948 2.913Trial 2 3.803 4.811 4.467 4.922 NATrial 3 4.015 4.841 4.444 4.967 NAAverage 3.830
± 0.170
4.827 ± 0.015
4.464 ± 0.018
4.987 ± 0.023
2.913
Deceleration on Difference Surfaces (From Deceleration on Difference Surfaces (From Graph)Graph)Deceleration on Difference Surfaces (From Deceleration on Difference Surfaces (From Calculation)Calculation)
s = ut + ½ at2
4.98 = (6.94)(17.50 – 16.19) + ½ (a)(17.50 – 16.19)2
4.98 = (6.94)(1.31) + ½ (a)(1.31)2
4.98 = 9.09 + (0.86)(a)(0.86)(a) = -4.11a = -4.78 m/s/s
Velocity vs Time of a Bike (on main road)Velocity vs Time of a Bike (on main road)
Surface Gravel Road Tile Road
Grass Wet Road
Trial 1 3.60 4.66 4.44 5.01 3.19Trial 2 3.87 4.76 4.53 5.18 NATrial 3 3.93 4.78 4.52 5.05 NAAverage 3.80 ±
0.24.730±0.06
4.50 ± 0.04
5.08 ± 0.1
3.19
ConclusionConclusion
5
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