by MONICA CUEVAS

THE BIG LET DOWN

299780 — 2015-09-22 18:52:13 UTC

293367 — 2015-09-22 18:52:42 UTC

PROCEDURES: DEVICE CREATION

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1. Make a cylinder with typing paper and construction paper rapped around it.

2. Place the rubber-band in a sling-shot style by taping the ends of the rubber-band opposite from one another on the sides of the cylinder

3. Place sticks around cylinder to make it more sturdy (adding support)

4. Trial Data

5. Add more tape to popsicle sticks to add stability and balance.

Hypothesis

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If we rebuild a stronger and a more stable Cylindrical model, then the time of the airborne will increase; the launching of the ball step would be easier.

Problem

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To build a device that can make the ball stay in the air as long as possible.

Introduction

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An engineering design project modified to apply the scientific method.

Data Evaluation

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After testing our device through 5 trials, we concluded that the average time for the ball when launched was 1.9 seconds; however, when the time came for the actual launching test, our ping pong ball was airborne for an average of 1.01 seconds. Our data was inconsistent because for the first three trials, the time airborne was about 1.4-1.8 seconds; however, for the last two trials, the ball was airborne for 2.3 seconds. This inconsistency occurred mainly because of the direction that the launcher was pulling the rubber band.

Team problem

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The device built (the first attempt) was fragile, which meant that launching the table tennis ball would be difficult; the circumference of the cylinder gets compressed after the pull of rubber band. The device was unstable as well due to the fragility (cause.)

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Purpose

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To practice the steps of the scientific method by choosing variables to test and collect data

Conclusion

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After our first attempt of testing our device who's purpose is to launch a ping pong ball into the air and stay airborne for as long as it can, we noticed that our device encountered several problems. First, we had a shortage of materials, so we had to compromise and try to use the materials very wisely, especially the tape because it held our device together. The second problem was that our device was not very stable; therefore, the launcher had to hold the device tightly onto the table, but the launchers hand interfered in the ping pongs ball's way. Our new goal was to build a more stable device. If we build a more stable device, then the launcher will not need to hold it tightly against the table, and nothing will get in the way of the ball from launching up. After our second attempt of testing our improved, and more stable device, the ball was able to launch upwards after several trials; however, we noticed that the main issue was the structure of the device. For example, since the device was more stable, the launcher didn't need to hold it tightly on the table, but the tube caused interference with the ball as it launched because it hit the walls of the cylinder. Overall, we decided that if we were to create a device with a bigger, more stable structure (that is not a cylinder) than nothing that is part of the device would interfere with the ball as it launches.

PROCEDURES:Device launching procedure

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1. Prepare the device position; make the ¨Launcher¨, hold the rubber band part from the bottom (under the table.)

2. Make another teammate hold the device from the top (by using the grapple technique-- the two Popsicles.)

3. Teammate #1 pulls on the ¨slingshot¨ part and apply the table tennis ball to its proper position (teammate pulls on the rubber band accordingly-- trial table test; measure the pull force in Inches)

4. Release the rubber band then record the time

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Analysis

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1. The more focused the objective was ( work on fixing fragility along with instability) the less problems we had with launching the ball since the first attempt alluded to the main conflict our team had with the Cylindrical model.

2. Our team conducted 5 trials all of which were not enough to make the " Holo Cylinder" reach its optimum. Since the best time was 2.1 seconds, we clearly needed more trials, but we ran out of time. Although we had fewer trials, it was our model that was the defect .

3. The device team 3 possessed produced the longest time of 1.8 (first trial), and what they did was slightly slant the device to the left before launching, pull the rubber band to its "max" -- bonus technique: keep the ball from coming off ( ball slot.)

4. Rebuild the whole model and change the structure to rely on sticks and straws more. The idea of using paper as a primary material went wrong (somewhat)

298451 — 2015-09-25 05:20:32 UTC

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298451 — 2015-09-25 05:31:04 UTC

298451 — 2015-09-25 05:31:19 UTC