Parachutes Experiment - Abhirath Singh
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-Abhirath Singh 9C Parachutes Experiment Aim: 1. To determine that the surface area of a parachute can affect the time it takes to travel a calculated distance, and therefore affecting the speed at which it falls. Hypothesis: 1. The surface area of a parachute affects the time it takes to travel a calculated distance, and the speed at which it falls. 2. Parachutes with a larger surface area will fall slower than ones with a smaller surface area, and will also take a longer time. Background: Parachutes are used by people in order to land safely from the air. These parachutes work on the basic law of air resistance. As a parachute opens up, it causes resistance against the air, causing the person using it to slow down. There are several factors that affect the way a parachute falls. These include; weight of user, force of winds blowing against the parachute, direction of winds against the parachute, material of parachute, weather conditions and surface area of parachute.
6) Measure the height of the person dropping the parachute. And add this height to the height measured in Step 5. 7) Hold the parachute from the center of the polythene sheet and keep it at the level of your height. 8) While holding a electronical stop watch in your hand, drop the parachute onto the place where you want your parachute to land, simultaneously starting the electronical stop watch. 9) As the parachute hits the area you wanteded it to land, stop the electronical stop watch. 10) Note down the time taken. Take minimum of 3 readings. 11) Repeat the experiment for the following dimensions: 10cm by 10cm (100 cm2), 15cm by 15cm (225 cm2), 20cm by 20cm (400 cm2) and 25cm by 25cm (625 cm2). Data: Weight of Plasticine used = 4.98 grams. Distance traveled by parachute = 3.30 meters. Data Table - 1 Attempt No. 5cm by 5cm (25 cm2)
Therefore we can conclude that parachutes with a larger surface area fall more slowly and take a longer time than ones with a smaller surface area. Therefore, if a person using a parachute would want a soft and safe landing with ease, they would use a parachute with a larger surface area. Errors and Modifications: 1. The square cut out of polythene were not exactly a square. 2. While the parachute was traveling, there could have been air blowing from any of the directions, causing a change in the time taken by the parachute, and therefore its speed. 3. As the steps are not level, the parachute may not have landed one or two steps lower, making it travel a longer distance, causing a change in the time taken by the parachute, and therefore its speed. 4. If the parachute was folded a little more than another, it would take longer to open up, causing a change in the time taken by the parachute, and therefore its speed.
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Here's what a star student thought of this essay
Response to the question
The writer was able to answer the question to a decent standard, but could have potentially gone into more detail. The writer is able to approach each section of their report to a decent standard, but doesn't exact use the ...Read full review
Response to the question
The writer was able to answer the question to a decent standard, but could have potentially gone into more detail. The writer is able to approach each section of their report to a decent standard, but doesn't exact use the correct terminology (for example, when they mentioned "Materials", this should be the "apparatus"). The writer should have explained in the methodology why they decided to use a flight of stairs for their height and why they didn't do it from say the top of a building.
All data was presented well in a table. However, the graph could have been presented better (in the form of 2 line graphs, where one would represent the time and the other would be the velocity). The analysis and conclusions were simple but got to the point straight away. It was good the writer looked at error modification.
Level of analysis
the language that the writer had used was very basic and could have gone into so much more detail. The writer starts this off with not using the appropriate language for different areas of the experiment ("Materials" instead of "Apparatus"). In addition, the writer should have gone into more analysis in regards to their experiment and why they decided to do particular methods. The graph could have been presented in the form of line graphs. In addition, for the nature of the experiment a preliminary investigation would have been appropriate as it would have given the writer an opportunity to look at the areas which could have been improved for the main investigation.
Quality of writing
As mentioned before, the writer should have presented the graph better and in addition introduce page numbers so that a reader reading the report would be able to follow it well. In addition, spelling and grammar was quite poor and what the reader should do it read through their report line for line to make sure that this situation doesn't occur.
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Reviewed by cpdavis 02/03/2012Read less
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