Investigating A Factor That Affects The Rate Of Decent Of A Parachute

2047 words - 8 pages

Investigating a Factor that Affects the Rate of Decent of a Parachute

Aim- To investigate one factor that affects the rate of decent of a

parachute.

Plan

There are many factors that affect the rate of decent of a parachute,
some of these are: The weight of the object on the end of a parachute,
the weight of the parachute, the length of the strings on the end of
the parachute, the surface area of the parachute, and the shape of the
parachute. As we were only instructed to investigate one of the
factors listed above we chose to find out how the surface area of a
parachute affects it's fall.This is how we are going to carry out our
experiment:

Firstly we will cut out 8 differently sized parachutes from a black
binliner. The parachutes will be sized 25cm (5cm 5cm), 100cm (10cm
10cm), 225cm (15cm 15cm), 400cm (20cm 20cm), 625cm (25cm 25cm), 900cm
(30cm 30cm), 1225cm (35cm 35cm), 1600cm (40cm 40cm). These sizes are
evenly spaced because when i come to plot my results on a graph they
will be alot easier to read and hopefully a pattern will appear.

Secondly we will cut out some lengths of string. 32 lengths of string
will be needed in all (one for each corner of each parachute). All of
the pieces of string should be the same length (40cm) as any variation
in length could affect the results because longer strings would make
the plasticine touch the ground before shorter ones, and if the
strings on one parachute were all different the parachute would be
pulled down in a wierd shape which may also affect the outcome. The
strings should be attached at the same position of each corner on each
parachute to prevent the parachute being pulled down ina strange shape
and so affecting the results, differing positions of th strings could
also change the length of the strings going from the parachute to the
object this would have the consequences as described above. We will
use sellotape to attach the string to the corners of the parachutes,
we must be carefull to put the sellotape on flat so that the binliner
doesn't ruckle and turn the parachute into a funny shape so it affects
the results.We measured both the parachutes and the strings using a
meter ruler.

Thirdly we will attach a lump of plasticine to the ends of the strings
of each parachute. The lump of plasticine must be put on at exactly
the same point on the strings on each parachute so that the out come
isn't affected by the parachutes being pulled down awkwardly or the
strings being longer/shorter so that the parachute touches down
quicker/slower. The plasticine should also be exactly the same mass
(5grams) for each parachute because if there is more weight on some of
the parachutes those parachutes will be pulled down faster and if
there is less weight on some of the parachutes those parachutes will
be pulled down...

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