Time of Car to Travel 300 cm onVarious Road Conditions (s)

GritTrial

1Trial

2Trial

3Trial

4Trial

5Trial

6Trial

7Trial

8Trial

9Trial10

P60 1.19 1.21 1.25 1.22 1.25 1.28 1.16 1.31 1.16 1.12

P100 1.15 1.09 1.19 1.16 1.16 1.22 1.19 1.18 1.13 1.10

P150 1.12 1.09 1.12 1.22 1.11 1.12 1.28 1.09 1.18 1.12

P180 1.13 1.16 1.16 1.19 1.12 1.16 1.10 1.11 1.12 1.22

P220 1.07 1.15 1.13 1.18 1.16 1.18 1.16 1.09 1.15 1.19

P320 1.16 1.16 1.1 1.09 1.13 1.12 1.18 1.16 1.07 1.09

No Sand-paper

1.13 1.06 1.03 1.10 1.12 1.06 1.15 1.06 1.12 1.06

Average Speed of Car over 300 cm onVarious Road Conditions (s)

GritTrial

1Trial

2Trial

3Trial

4Trial

5Trial

6Trial

7Trial

8Trial

9Trial10

P60 252.10 247.93 240.00 245.90 240.00 234.38 258.62 229.01 258.62 267.86

P100 260.87 275.23 252.10 258.62 258.62 245.90 252.10 254.24 265.49 272.73

P150 267.86 275.23 267.86 245.90 270.27 267.86 234.38 275.23 254.24 267.86

P180 265.49 258.62 258.62 252.10 267.86 258.62 272.73 270.27 267.86 245.90

P220 280.37 260.87 265.49 254.24 258.62 254.24 258.62 275.23 260.87 252.10

P320 258.62 258.62 272.73 275.23 265.49 267.86 254.24 258.62 280.37 275.23

No Sand-paper

265.49 283.02 291.26 272.73 267.86 283.02 260.87 283.02 267.86 283.02

• The speed varies from 229.01 cm/s to 267.86 cm/s. • The trials are very consistent except for trials 7-10. • You could hear the roughness of the road.• Car was shaky.

• The speed varies from 245.90 cm/s to 275.23 cm/s. • The different trials were fairly consistent.• Car was shaky.

• The speed varies from 234.28 cm/s to 275.23 cm/s. • The different trial were fairly consistent with the exception of 4 and 7.• Car was shaky.

• The speed varies from 245.90 cm/s to 272.73 cm/s. • The trials were very consistent the entire time. • Car ran smoother.

• The speed varies from 252.10 cm/s to 280.37 cm/s. • The different trials were very consistent with the

exception of 1 and 9. • Track sounded smoother.

• The speed varies from 254.24 cm/s to 280.37 cm/s. • The different trials were not greatly consistent as you

can see by the range.

• The speed varies from 260.87 cm/s to 291.26 cm/s. • The trials were not as consistent.• The car seemed to go very fast, little sound.

Speed of Car on Various Road Conditions (cm/s)

Grit Average Time (s) Average Speed (cm/s)

P60 1.215 246.9

P100 1.157 259.3

P150 1.145 262.0

P180 1.147 261.6

P220 1.146 261.8

P320 1.126 266.4

No Sand-paper 1.089 275.5

• The lowest grit of sandpaper was the slowest and the speed continued to rise until the P150, P180, and P220s when they were about the same Then it continued to rise.

• The lower the grit the lower the speed the higher the grit the higher the grit.

Possible Errors

• The car wheels could have gotten rougher the more trials I ran it down the track.

• Particles could have come loose when I ran the car down the track.

Conclusions

• My hypothesis was supported. The rougher the road the lower the speed. The smoother the road the higher the speed.

• Construction crews and racetrack owners could try to make their roads smoother to let cars go faster.

• Speed limits should reflect the roughness of the road.

• I would like to do further research to find cars speed in different elements such as water, snow, ice, asphalt, and dirt.

Conclusions

• In my hypothesis, I thought the smother road would produce faster car speeds and the rougher road would produce slower car speeds.

• The lower the grit the lower the speed the higher the grit the higher the speed.

• Medium grits are all about the same.• The run with no sandpaper was much faster

than the others.

Thank You