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Science Fair ProjectProjectile Projection
Trebuchets
Jack Tiffany
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Statement of the Problem
Does the weight of the counterweight and/or projectile affect the distance the projectile is launched?
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Project Overview
I shot the projectiles while changing the weight of the projectile and that of the
counterweight. I then recorded all of it on a chart.
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Research Summarize your research here in three to five bullet points:
Trebuchets have been used since the middle ages. Trebuchets are more accurate than catapults.
Trebuchets are more simple to make. The Trebuchet was invented in China in 300AD
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Variables
Independent variable: The weight of the counterweight and the projectile. Dependent variable: The distance the projectile is launched.
Constant variables: Length of the arm, size of trebuchet, distance arm is pulled, amount of time launched, size of basket.
Control group: The 10 launches with my 1lb weight
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Hypothesis Hypothesis/Prediction is the more the weight of the counterweight the
farther the projectile will go. The heavier the projectile the less far it will go.
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Materials Trebuchet from Science Olympiads 20g, 40g, and 60g ball from Science Olympiads 3 meter sticks A 1lb, a 2lb, a 3lb counterweight
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Procedure
1. set the counterweight to 1lb 2. Load the 40g ball into the basket 3. Pull back string to mark 5. 4. Launch, measure, and record. 5. Repeat steps 2-4 9 more times 6. Set the counterweight to 2lbs. 7. Repeat steps 2-4 10 times. 8. Set the counterweight to 3lbs 9. Repeat steps 2-4 10 times 10. Record all the results on the chart
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Data/Observations (Analyzes)
1 kg at 40 grams 2kg at 40 gramms rams 3 kg at 40 grams
trails distance trails distance trails distance
1 1.24 1 1.42 1 1.622 1.29 2 1.34 2 1.72
3 1.27 3 1.3 3 1.8
4 1.28 4 1.4 4 1.61
5 1.46 5 1.45 5 1.63
6 1.29 6 1.4 6 1.6
7 1.26 7 1.38 7 1.64
8 1.34 8 1.4 8 1.7
9 1.23 9 1.27 9 1.8
10 1 10 1.43 10 1.5
1.266 1.379 1.662
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Conclusion
The heavier the counterweight, the farther the projectile is launched. The heavier the projectile is, the less distance the projectile is launched.
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Possible Experimental Errors
I may have launched it at mark 4 a few times. The string may have caught on the arm, reducing the distance. I may have not accurately measured the ball a few times.
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Applications and Recommendations
To improve the results, I would have run the experiment 15 times instead of 10. Also I would have made sure to check the recoil. This could be used in real life if you were trying to throw a basket ball and a bowling ball. You wanted to throw them to a friend and didn’t
know how much force to use.