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# Scientific Investigation: Catapults

Extracts from this document...

Introduction

Scientific Investigation: Catapults Variables: * Weight of projectile * Shape of projectile * Surface of the runway * The distance in which the band gets stretched The variable I will change is the weight of the projectile I think the weight of the projectile will effect the distance traveled, I think that if the weight of the projectile is reduced then it will be able to travel further down the runway than if it had any weights in. I think that the projectile will move further when the weight is decreased because there will be less friction and weights' slowing it down as it is projected down the runway. VARISABLE. HOW IT IS GOING TO BE CHANGED OR KEPT THE SAME THROUGH OUT THE EXPERIMENT. Weight of the projectile I am going to change this variable through out the experiment. I going to do this by adding a 10g weight on to the projectile after every experiment I will repeat this process until the projectile has a 100g weight inside. ...read more.

Middle

Prediction 2 I think that if the 100g mass is doubled then the distance traveled by the projectile would half. I would display these results on a line graph, this is what I think it would look like. I don't think there is a scientific reason for my new prediction, I just looked at my results from before and the average distance traveled from the 20g weight is just over double than what the 40g weight traveled. Preliminary results. MASS (G) LENGTH TRAVELED ON RUNWAY (CM) AVERAGE LENGTH (CM) 1ST 2ND 3RD 0 200 190 184 191.3 10 80 82 86 82.6 20 40 43 55 46 30 30 43 37 36.6 40 20 27 31 26 50 15 29 34 26 My preliminary results helped me decide to increase the mass up to 100g so I could gather a wider range of results to plot on the graph. I also decided to repeat the experiment 3 times so I got more accurate results. Analysis of results From this experiment I have learnt the following: * How to record information on to a table and graph. ...read more.

Conclusion

Results from another group. MASS (G) LENGTH TRAVELED ON RUNWAY AVERAGE LENGTH (CM) 1ST 2ND 3RD 10 73 91 71 78.3 20 69 76 61 68.6 30 52 53 50 51.6 40 45 34 41 40 50 43 46 29 39.3 60 32 27 26 28.3 70 23 14 28 23.3 80 15 13 19 15.6 90 15 18 12 15 100 9 13 11 11 On the graph below the line of best fit does not flow in a smooth curve therefor the results may not be accurate. Evaluation During the experiment I did not notice any errors. The only thing I could improve is that I should have repeated the experiments to see what the average result was like out of five. None of my readings were odd they matched my line of best fit and flowed in a nice smooth curve. When I was comparing my results with the other group I noticed that their results were "odd," as they did not have a line of best fit and maybe they did not record their results accurately. 1st October 2001 Andrew McLeod 11IMT ...read more.

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