A grade GCSE Physics experiment - Investigation into the effect of parachute surface area in relation to its fall time

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I am going to investigate the effect of a parachutes surface area in relation to its fall time.

Prediction

I predict that the larger the surface area of the parachute the greater amount of time it will take to reach the ground. This is because a larger surface area will have a bigger air resistance meaning that more air particles collide with the parachute as opposed to a smaller surface area. Similarly, when the surface area is reduced, the time taken for it to reach the ground decreases because less air particles collide with the parachute, i.e. there will be less air resistance. Also, although a parachute with a larger surface area would weigh more and therefore experience a greater downward force of gravity, it would still have much more air resistance and so, would still not fall faster than a smaller parachute.

Method

Firstly I will cut out eight different sized parachutes from paper. The parachutes will be of radius 12cm, 11cm, 10cm, 9cm, 8cm, 7cm, 6cm and 5 cm. The sizes are evenly spaced because when I come to plot my results they will be easier to read and hopefully a pattern will appear.

I will then measure a height of 2 meters and make a mark on the wall on which I will drop each parachute from. I will drop each of the parachutes four times in total and with a stopwatch I will record the time taken for the parachute to reach the ground from the time when is dropped to the point when it hits the ground. I will take the average fall time from each parachute and record the results on a graph.

Diagram 1


How a parachute is made

A circle is cut out with the relevant radius. A solid line is drawn horizontally from the centre to the edge. A dotted line is then drawn 60o away from the solid line. The solid line is cut and rotated round to meet the dotted line where it is glued in place. A parachute shape is made. (See diagram 1)


Apparatus

The apparatus I will use in this investigation are as follows:

  • Paper A5 – that can be cut into different sized circles
  • Measuring tape
  • Ruler
  • Protractor
  • Stopwatch
  • Scissors
  • Glue

Safety

There is not much safety to consider in this experiment however, I will make sure this experiment is as safe as possible.

Diagram 2


Variables

There are different variables which can be changed in this experiment. I am however, due to my line of enquiry, going to change the surface area of the parachutes. The variables I will control will be the height I drop the parachute from, the type of material I use for the parachute and the conditions of the environment, also the mass (i.e. I will not put any paper clips or clay on the parachutes.)

Below is a table showing the effect of changing variables. (Table 1)

Table 1


Fair Test

To ensure the investigation is fair I will keep all the variables the same apart from the one I am changing. I will also try to carry out the investigation to greatest degree of accuracy I can manage. This means that I will drop the parachute from the same height each time but the surface area will be altered each time. I will keep the air vents and windows closed as this will affect the rate at which the parachute falls. Although air resistance and gravity will affect the fall of the parachute, I cannot control these factors; however, it will be the same for each experiment so the results should be unbiased.

Below is a sample graph (graph 1) to show the kind of results I expect to obtain.

Graph 1

Results


Below are the results I have obtained


I can see, by observing the table that the larger the surface area of the parachute the greater amount of time it took to reach the ground. This means that the larger the surface area the more air particles (air resistance) hit the parachute. Similarly, the smaller the surface area of the parachute the less air resistance there was.

On the next two pages is a Bar Chart and scatters graph showing the results of the experiment. (draw a bar chart from the results you have obtained)

Conclusion


In conclusion, there is very strong evidence to show that the larger the surface area (radius) of the parachute the longer it will take to fall to the ground. This is because more air particles collide with the parachute when there is more surface area as opposed to a smaller surface area. Even though there is more gravity acting on the larger parachutes the smaller ones are more streamlined and also have less air resistance. These two factors therefore meant that they fell to the ground in a shorter time.


Diagram 1 illustrates that there was less air resistance because the surface area of the parachute is smaller than that the parachute in diagram 2 i.e. the parachute in diagram 1 is more streamlined and so fell more quickly as opposed to the other less streamlined parachute.

The evidence I have obtained shows that my prediction “the larger the surface area of the parachute the greater amount of time it will take to reach the ground” was correct. Also the graph I drew showing the results I expected matched the pattern of the actual results.

Evaluation

All of my results fitted my pattern of results. I did not have any problems when I was carrying out the experiment apart from with timing. There were a few times when I got extremely “bogus” times that were more than a 2 seconds out from the repeat times. I overcame this by timing the fall of the parachute again.

The quality of my evidence is good, there were no points on my scatter graph that were not on, or close to the line of best fit, There were also enough results to show that my prediction was correct. I only circled two anomalous results that were close to the line, but not as close as the other results.

All of the method worked well apart from the timing. The timing was too difficult to make as accurate as possible as this would have cost money. I had to rely on my reactions as to when the parachute was dropped and when it landed. However my reactions would have been similar on each of the parachutes.

I could have got a friend to time but the results would have turned out relatively similar. Another way I could have timed would be if I used some sort of machine that could have timed the fall of the parachute, but as afore mentioned it would have cost money and would not be readily available.

By comparing the repeated times on each of the parachutes I can see that they were similar and each one was within a tenth of a second of each respect. From this evidence I think my results were pretty reliable.

Regarding the two anomalous results I circled on the scatter graph, they might not have been accurate because of the method of timing.

In order to provide additional evidence and extend my investigation to find out more and back up my conclusion I could perhaps get a machine that would drop and time the fall of each parachute. I could also change the material and see if I get a similar pattern of results. I might consider changing the radius of the parachutes I already have and record the results. Another thing I could change is the height I drop the parachutes from and see if this effects the conclusion I have made, also the weight could affect my idea about air resistance.

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Comments 20 comments

tahalabo 3 years ago

fantastic thanks guys


TAHII 3 years ago

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talababshallbabkebabboobjob 3 years ago

thanks you b;bpbpb;b;


Luno2012 profile image

Luno2012 3 years ago from United Kingdom Author

You are welcome, guys. :)


flip flop dude 3 years ago

help me im stuck in a mental hospital, but as you can tell im not mental. im a nerd get me out of here now


would u like a burger 3 years ago

u do not say that but hi how is it in there?


flip flop dude 3 years ago

well its completely white with pink and orange spots. It also has a lovely peting zoo, yet it still crowded and extremley dirty. but the reason most people die in here is because of Me. That's what happens when you give me a spork, its plastic but you will be surprised what you can do with a bit of plasti. The most valuable thing in here are swimming trunks, no more mishaps in the showers.


flip flop dude 3 years ago

plastic, im also part of the grammer police


wow 3 years ago

wow you are a nice guy can i buy you a drink


,m.m. 3 years ago

excuse me but who do you think you are


flip flop dude 3 years ago

well you could but as you can tell im stuck in here


would u like a burger 3 years ago

SPORK


mo 2 years ago

Hello luno2012

Can you tell me please what grade did you get for this experiment?(just i would like to know what grade to expect if i write similar things)

Thank you in advance


Luno2012 profile image

Luno2012 2 years ago from United Kingdom Author

Hello Mo,

It was an A or B grade, I cannot remember totally, but i never got lower than a B ;) good luck.


Mo 2 years ago

Hello luno2012

its me again :)

You do not have to help me,but if you would then i appreciate your further help.

Can you please give me some references which you used in this investigation?

Many thanks Mo


hi 2 years ago

chocolate


you are all cunts 2 years ago

hey guys :)))))))))))))))


flip flop dude 2 years ago

Hi guys. Thanks a lot im still stuck in here.


would u like a burger 2 years ago

hi im now stuck in there to


flip flop dude 2 years ago

Im. I still have a membership with the grammer police

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