Physics Practical - Average Speeds

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Practical: Measuring Average Speed Aim: to determine the average speed of 2 door cars and 4 door cars along Anzac Parade between 11:30a.m – 12:00a.m on the 5th February 2008 Hypothesis: My hypothesis is that 2 door cars will have a higher average speed because they are usually lighter and faster. Also many 2 door cars are sport cars driven by younger drivers who enjoy traveling at higher speeds. Equipment: • Yellow Markers indicating 100m • Stopwatches • Tape measure Procedure: • Measure out 100m length on the footpath next to Anzac Parade • Position one person at the start • Position three people at the end, with stopwatches • First person drops arm as car passes, indicating the start of stopwatches • The three people with stopwatches measure the time taken and calculate an average of the three taken times • Record results • Repeat for 6 cars of both 2 door and 4 door • Tabulate results Diagram: Results: Car Number 1 2 3 4 5 6 Total Average 4 door cars Average time (seconds) tav 5.67 6.87 5.87 5.92 6.00 6.29 6.10 Average Speed (m/s) Sav 17.64 14.56 17.04 16.89 16.67 15.90 16.45 2 door cars Average time (seconds) tav 6.29 6.45 6.35 6.62 5.92 6.24 6.31 Average Speed (m/s) Sav 15.90 15.50 15.75 15.11 16.89 16.03 15.86 Conclusion: In conclusion, the experiment was a success as we competently determined the average speeds of 2 door and 4 door cars, which was the aim. From the table of results, we can see that the average velocity of 4 door cars was higher as they on average, traveled at higher speeds than 2 door cars. This proved my hypothesis was incorrect as the 2 door cars did not have a higher average speed than the 4 door cars. Although the results show that the 4 door cars had a slightly higher average speed, we concluded that the number of doors on the car did not have a