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year 9 sycamore investigation

Extracts from this document...

Introduction

Name: Ayesha Mirchandani Class: 9A Teacher: Mr.Grady Year 9 Sycamore Investigation Aim: To investigate how the mass of a sycamore seed affects it's landing time. Introduction: Seeds have to be dispersed so that they have space to germinate. There are four ways of dispersal but in this investigation we are going to be examining wind dispersal. Wind dispersal is affected by many factors like mass and shape. I have chosen to study the effect mass has on wind dispersal. I am going to use the shape of a sycamore seed to investigate the effect on mass. The sycamore fruit has two curved "wings" that act like propellers on a helicopter. It's shape is designed perfectly as it helps the wind carry it along. PLANNING (8) Preliminary investigations: 1. Should we make the sycamore seed out of paper or cardboard? We made two sycamore seeds one out of paper and the other out of cardboard. We then dropped both at a height of 155 cm. After dropping both we discovered that the sycamore seed made out of cardboard was the best material to use. ...read more.

Middle

The windows, air conditioner and doors will be closed therefore the wind speed will be zero throughout all the experiments. To insure this fact, a anemometer (apparatus that measures wind speed) will be present. * Every time blue- tack is added to the model to increase it's mass it will be added on top of the previous. Apparatus: One anemometer (gadget to measure wind speed) A pair of scissors A glue stick One piece of cardboard A packet of blue tack Two rulers (100cm) Electronic measuring scale One stopwatch An empty room The cut out sheet A pencil A 30cm ruler Method: 1. Copy the diagram on the cut out sheet on to a piece of cardboard. Use a 30cm ruler to make sure the measurements are the same as labeled on the sheet. 2. Cut along the bold lines. 3. Fold along the dotted lines. 4. Fold part A forward. 5. Fold part B backward. 6. Fold in part D . 7. Fold in part C so it overlaps part D. ...read more.

Conclusion

0.89 0.94 0.87 0.82 0.75 0.85 3.08 0.0308 0.92 0.92 0.76 0.72 0.87 0.84 3.93 0.0393 0.76 0.73 0.80 0.52 0.64 0.69 5.24 0.0524 0.74 0.42 0.61 0.90 0.48 0.63 7.69 0.0769 0.59 0.56 0.68 0.66 0.66 0.63 9.56 0.0956 0.56 0.70 0.44 0.50 0.34 0.51 OBTAINING EVIDENCE (8) ANALYSING EVIDENCE AND DRAWING CONCLUSIONS(8) Diagram/Graph and Conclusion EVALUATING EVIDENCE(6) Evaluation of method If I were to do this experiment again I would add shape as a control variable list. I would do this because as we added the blue tack the shape changed, which caused the sycamore to spin differently. I would also add, "same person doing all the experiments" as a control point Evaluation of Results The results were fairly accurate as the differences of results (when repeated) varied from 0.00 to 0.70. However, when I changed the mass of the sycamore seed from 5.24 grams to 7.69 grams both the average time of landing were 0.63 seconds. I think this happened because Susan recorded the time of landing for 5.24 grams and I recorded the time of landing for 7.69 grams. ?? ?? ?? ?? October 2007 ...read more.

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