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# Projectiles Lab - From the experiment I conclude that indeed, the range of a projectile does depend on the angle at which it is projected. Moreover, up until around 40-50 degrees,

Extracts from this document...

Introduction

Alexander Zouev

Physics IB, 3/09/06

Projectiles Lab

Data Collection

Distance rubber band pulled back each time: 20 cm

Note: all range distances achieved are given as where the rubber band made impact with the floor, NOT where it eventually came to a standstill.

Raw Data Tables + Collection

 Band Projected at 5º (±1º) Trial Distance achieved ±1 cm Average distance achieved 1 165 138cm (3.s.f) 2 120 3 130
 Band Projected at 15º (±1º) Trial Distance achieved ±1 cm Average distance achieved 1 200 250cm (3.s.f) 2 250 3 300
 Band Projected at 25º (±1º) Trial Distance achieved ±1 cm Average distance achieved 1 250 275cm (3.s.f) 2 275 3 300

Middle

2

320

3

400

 Band Projected at 40º (±1º) Trial Distance achieved ±1 cm Average distance achieved 1 380 383cm (3.s.f) 2 350 3 420
 Band Projected at 42º (±1º) Trial Distance achieved ±1 cm Average distance achieved 1 400 393cm (3.s.f) 2 400 3 380
 Band Projected at 45º (±1º) Trial Distance achieved ±1 cm Average distance achieved 1 380 386cm (3.s.f) 2 380 3 400

Conclusion

Improving the investigation

Were we to repeat an experiment of a similar nature over again, there are several changes I would implement to limit the weaknesses.  Firstly, by using a marble or some sort of more dense and inelastic material you minimize interference from the wind greatly.  Although it is true that you cannot project a marble simply with an incline plane like we did with the rubber band, but some sort of projection gun device could be obtained.  Another realistic suggestion would be to use a protractor instead of trusting the markers on the incline plane.  I believe this would slightly increase the accuracy since the protractors are pretty clear.

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