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Car speeds

Introduction
Along the David low way in colon coming up to the Pergian roundabout the speed limit is 60km/hr this is a change in speed from the highway which is 80km/hr the speed change here is because it is in a suburban area and a school zone. Speed limits are needed on our road to help prevent accidents and car collisions. The formula for speed is d/t=s (distance over time equals speed)

Aim
The aim of this prac was to use a simple technique to measure the straight line speed of cars on the David low way.

Hypothesis some cars along the David way will speed
Methods
Cars
Drivers
Stop watch
Football posts
We organized our selves into groups of 3 with one person at each football post and one to write down our times.
The football posts on the far oval where used as start and finishing points. We stood at opposite ends of the oval in a straight line with each other. We chose a car travelling down the road and when it passed the first person they swung there arm to indicate that it was time to start timing the car.
The time was them measured for 100m and calculated to have a sum of km.hr. We repeated this process for 5 cars driving each direction.
All the results where then recorded into a data table.

Results the data was collected by writing down the times and distances of each car and the formula d/t = s was used to get the answer in a result of m/s this was them multiplied by 3.6 to get a result of km/hr. Table a Car description | Distance (m) | Time (s) | Speed (m/s) | Speed (km/hr) | White 1 | 100 | 6.75 | 14.8 | 53.28 | Honda | 100 | 5.90 | 16.9 | 60.84 | Toyota | 100 | 5.45 | 18.3 | 65.88 | Suzuki | 100 | 5.87 | 17 | 61.2 | White 2 | 100 | 8.66 | 11.5 | 41.4 | Blue 1 | 100 | 8.49 | 11.8 | 42.48 | Blue 2 | 100 | 6.1 | 16.4 | 59.04 | Truck | 100 | 6.11 | 16.4 | 59.04 | Station wagon | 100 | 5.87 | 17.035 | 61.32 | swiftly | 100 | 6.5 | 15.38 | 55.38 |

Graph b

Discussion
In the results it was found that most cars traveling towards the roundabout where speeding slightly whilst most of the cars travelling in the opposite direction were driving under the speed limit. The data shows that most cars driving on the David low way where not speeding very much and the ones that did where only going 1 or 2 km over the speed limit and the two larger cars where traveling at about 10km under the speed limit. The data was shown using table A and graph b to show the speeds at which the cars where travelling. This prac worked very well to measure the speeds of cars along a straight stretch of the David lo way. Our group very well and the communication between the two people timing the cars was very accurate and our times didn’t vary too much. The only thing that didn’t work so well was when communication was lost between the two timing people when some one walked in front of them or the hand wave wasn’t obvious enough from the far distance. Next time each group should be spread apart more so that it easier to see your partner from the distance.
Conclusion
In conclusion it was found that near the Perigian round about only car entering the round about seemed to have been speeding.

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