Parachute Experiment
Prediction
My prediction is that as the weight of plastercine increases the time
taken for the parachute to reach the ground will decrease
I think this because when the weight has just been dropped it is going
slowly, but as it falls through the air it will gain speed until it
reaches its terminal velocity. The weight does not change but the A.R
gets bigger until it equals out the downwards force of gravity, so
when the weight is larger it will have to fall further before the
forces equal and it reaches terminal velocity.
A.R is equal to the weight of the falling mass being displaced in 1
second
What my experiment depends on is how fast the forces can balance. So
using a larger weight will mean it will reach its terminal velocity
slower.
Plan
Apparatus
Bin liner
4 equal lengths of string
10 one gram weights of plastercine
Stopwatch- to measure the time it takes for the parachute to reach the
ground
Meter ruler- to measure the distance the parachute has fallen
To make it a fair test I repeated the test 3 times and made an average
of my results.
Pre-test
As we had no idea on what size of parachute area, weight of
plastercine or length of string to use we had to do a pre-test, we
tested each variable. We found that the best surface area for the
parachute was half a bin liner. We would use 1-10 grams of plastercine
adding one gram at a time and that a length of 20cm for the string
would allow the parachute to open fully enough but not have it
collapse in on its self also we thought that an excess amount of
string would increase the weight on the parachute.
These are some of the pre-test results:-
Length of string (cm)
Time (s)
Weight (g)
10
2.41
1
10
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